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    <link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_B29089159C5BF79F2E6A8AD575ED9961_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_B29089159C5BF79F2E6A8AD575ED9961" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of Income Taxes</link:label>
    <link:label id="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_B29089159C5BF79F2E6A8AD575ED9961_label_en-US" xlink:label="lab_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_B29089159C5BF79F2E6A8AD575ED9961" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_208968630D57183608988AD575EE802B_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_208968630D57183608988AD575EE802B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of Income Tax Expense Using the Statutory Rate and Actual Income Tax Expense</link:label>
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    <link:label id="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6EFA672191FACC557B438AD575EE0519_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_6EFA672191FACC557B438AD575EE0519" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Components of Deferred Income Taxes</link:label>
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    <link:label id="lab_us-gaap_SummaryOfValuationAllowanceTextBlock_8B2701E72A8ABA56E1EE8AD575EED563_label_en-US" xlink:label="lab_us-gaap_SummaryOfValuationAllowanceTextBlock_8B2701E72A8ABA56E1EE8AD575EED563" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Summary of Valuation Allowance [Table Text Block]</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SummaryOfValuationAllowanceTextBlock_8B2701E72A8ABA56E1EE8AD575EED563" xlink:to="lab_us-gaap_SummaryOfValuationAllowanceTextBlock_8B2701E72A8ABA56E1EE8AD575EED563" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock_309CD5C75D189B5D094C8AD575EE06F1_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock_309CD5C75D189B5D094C8AD575EE06F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits</link:label>
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    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_B67875C5ECE5B3617330D2E99490FDC0_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_B67875C5ECE5B3617330D2E99490FDC0" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized net actuarial loss</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_B67875C5ECE5B3617330D2E99490FDC0_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_B67875C5ECE5B3617330D2E99490FDC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_B67875C5ECE5B3617330D2E99490FDC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_B67875C5ECE5B3617330D2E99490FDC0" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_B67875C5ECE5B3617330D2E99490FDC0" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_FFD599C0424023CF402CD2E9949154FF_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_FFD599C0424023CF402CD2E9949154FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected return on plan assets</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_FFD599C0424023CF402CD2E9949154FF_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_FFD599C0424023CF402CD2E9949154FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_FFD599C0424023CF402CD2E9949154FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_FFD599C0424023CF402CD2E9949154FF" xlink:to="lab_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_FFD599C0424023CF402CD2E9949154FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_4EC05D5B845A214B5E29D2E9949186F7_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_4EC05D5B845A214B5E29D2E9949186F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected contributions next twelve months</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_4EC05D5B845A214B5E29D2E9949186F7_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_4EC05D5B845A214B5E29D2E9949186F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_4EC05D5B845A214B5E29D2E9949186F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_4EC05D5B845A214B5E29D2E9949186F7" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_4EC05D5B845A214B5E29D2E9949186F7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_168F27C01F642F4CAE34D2E994912CC9_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_168F27C01F642F4CAE34D2E994912CC9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected contributions in year two</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_168F27C01F642F4CAE34D2E994912CC9_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_168F27C01F642F4CAE34D2E994912CC9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Two</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_168F27C01F642F4CAE34D2E994912CC9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_168F27C01F642F4CAE34D2E994912CC9" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_168F27C01F642F4CAE34D2E994912CC9" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_676206700D673F7B3FCED2E994917CCD_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_676206700D673F7B3FCED2E994917CCD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected contributions in year three</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_676206700D673F7B3FCED2E994917CCD_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_676206700D673F7B3FCED2E994917CCD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Three</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_676206700D673F7B3FCED2E994917CCD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_676206700D673F7B3FCED2E994917CCD" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_676206700D673F7B3FCED2E994917CCD" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_C251979609A0C15EFC0CD2E994914E85_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_C251979609A0C15EFC0CD2E994914E85" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected contributions in year four</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_C251979609A0C15EFC0CD2E994914E85_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_C251979609A0C15EFC0CD2E994914E85" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Four</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_C251979609A0C15EFC0CD2E994914E85" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_C251979609A0C15EFC0CD2E994914E85" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_C251979609A0C15EFC0CD2E994914E85" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3570D6376A076C1EEDB8D2E99491A4BB_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3570D6376A076C1EEDB8D2E99491A4BB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected contributions in year five</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3570D6376A076C1EEDB8D2E99491A4BB_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3570D6376A076C1EEDB8D2E99491A4BB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Five</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3570D6376A076C1EEDB8D2E99491A4BB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3570D6376A076C1EEDB8D2E99491A4BB" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_3570D6376A076C1EEDB8D2E99491A4BB" xlink:type="arc" />
    <link:label id="lab_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7_terseLabel_en-US" xlink:label="lab_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected contributions in year six</link:label>
    <link:label id="lab_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7_label_en-US" xlink:label="lab_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Six</link:label>
    <link:label id="lab_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7_documentation_en-US" xlink:label="lab_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Year Six</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix" xlink:label="loc_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7" xlink:to="lab_ctas_DefinedBenefitPlanExpectedFutureBenefitPaymentYearSix_843A0B0A5CD7B7BF10E3D2E9949147A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_782A9B0F2078A80798D5D2E994924A38_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_782A9B0F2078A80798D5D2E994924A38" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected contributions thereafter</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_782A9B0F2078A80798D5D2E994924A38_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_782A9B0F2078A80798D5D2E994924A38" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_782A9B0F2078A80798D5D2E994924A38" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_782A9B0F2078A80798D5D2E994924A38" xlink:to="lab_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_782A9B0F2078A80798D5D2E994924A38" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_8FC5F3020082C5639D7CD2E99492595D_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_8FC5F3020082C5639D7CD2E99492595D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of plan assets</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_8FC5F3020082C5639D7CD2E99492595D_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_8FC5F3020082C5639D7CD2E99492595D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Plan Assets, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_8FC5F3020082C5639D7CD2E99492595D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_8FC5F3020082C5639D7CD2E99492595D" xlink:to="lab_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_8FC5F3020082C5639D7CD2E99492595D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanBenefitObligation_E01E9A41F0F6FA66B8CCD2E99492D06C_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanBenefitObligation_E01E9A41F0F6FA66B8CCD2E99492D06C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Projected benefit obligation</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanBenefitObligation_E01E9A41F0F6FA66B8CCD2E99492D06C_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanBenefitObligation_E01E9A41F0F6FA66B8CCD2E99492D06C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Benefit Obligation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_E01E9A41F0F6FA66B8CCD2E99492D06C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanBenefitObligation_E01E9A41F0F6FA66B8CCD2E99492D06C" xlink:to="lab_us-gaap_DefinedBenefitPlanBenefitObligation_E01E9A41F0F6FA66B8CCD2E99492D06C" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18C540852FC9DC5C19DBD2E9949286F5_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18C540852FC9DC5C19DBD2E9949286F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net periodic benefit expense (income)</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18C540852FC9DC5C19DBD2E9949286F5_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18C540852FC9DC5C19DBD2E9949286F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Net Periodic Benefit Cost (Credit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18C540852FC9DC5C19DBD2E9949286F5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18C540852FC9DC5C19DBD2E9949286F5" xlink:to="lab_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_18C540852FC9DC5C19DBD2E9949286F5" xlink:type="arc" />
    <link:label id="lab_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A_terseLabel_en-US" xlink:label="lab_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Required years of service for plan eligibility</link:label>
    <link:label id="lab_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A_label_en-US" xlink:label="lab_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Eligibility, Required Years of Service</link:label>
    <link:label id="lab_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A_documentation_en-US" xlink:label="lab_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Eligibility, Required Years of Service</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_DefinedBenefitPlanEligibilityRequiredYearsofService" xlink:label="loc_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A" xlink:to="lab_ctas_DefinedBenefitPlanEligibilityRequiredYearsofService_E75D07AB1B9D56C0B57CD2E994927C9A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_7AD9CE793AF91F4BAD4DD2E99493076E_terseLabel_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_7AD9CE793AF91F4BAD4DD2E99493076E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employer contributions</link:label>
    <link:label id="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_7AD9CE793AF91F4BAD4DD2E99493076E_label_en-US" xlink:label="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_7AD9CE793AF91F4BAD4DD2E99493076E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Defined Benefit Plan, Plan Assets, Contributions by Employer</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_7AD9CE793AF91F4BAD4DD2E99493076E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_7AD9CE793AF91F4BAD4DD2E99493076E" xlink:to="lab_us-gaap_DefinedBenefitPlanContributionsByEmployer_7AD9CE793AF91F4BAD4DD2E99493076E" xlink:type="arc" />
    <link:label id="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_9A3469ED4D5A014F41D78AD576208F5F_label_en-US" xlink:label="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_9A3469ED4D5A014F41D78AD576208F5F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Service Contracts and Other Assets [Abstract]</link:label>
    <link:label id="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_9A3469ED4D5A014F41D78AD576208F5F_documentation_en-US" xlink:label="lab_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_9A3469ED4D5A014F41D78AD576208F5F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">-- None. No documentation exists for this element. --</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_GoodwillServiceContractsAndOtherAssetsAbstract" xlink:label="loc_ctas_GoodwillServiceContractsAndOtherAssetsAbstract_9A3469ED4D5A014F41D78AD576208F5F" xlink:type="locator" />
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    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6_terseLabel_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Other Assets [Table]</link:label>
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6_label_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Other Assets [Table]</link:label>
    <link:label id="lab_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6_documentation_en-US" xlink:label="lab_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of other assets.</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_ScheduleOfOtherAssetsTable" xlink:label="loc_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6" xlink:to="lab_ctas_ScheduleOfOtherAssetsTable_BA3743AD915E5CB29E288AD57620B1A6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ServiceAgreementsMember_296BAF93849665E735318AD57621ABA2_terseLabel_en-US" xlink:label="lab_us-gaap_ServiceAgreementsMember_296BAF93849665E735318AD57621ABA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts</link:label>
    <link:label id="lab_us-gaap_ServiceAgreementsMember_296BAF93849665E735318AD57621ABA2_label_en-US" xlink:label="lab_us-gaap_ServiceAgreementsMember_296BAF93849665E735318AD57621ABA2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Service Agreements [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ServiceAgreementsMember" xlink:label="loc_us-gaap_ServiceAgreementsMember_296BAF93849665E735318AD57621ABA2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ServiceAgreementsMember_296BAF93849665E735318AD57621ABA2" xlink:to="lab_us-gaap_ServiceAgreementsMember_296BAF93849665E735318AD57621ABA2" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets [Axis]</link:label>
    <link:label id="lab_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637_label_en-US" xlink:label="lab_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Axis]</link:label>
    <link:label id="lab_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637_documentation_en-US" xlink:label="lab_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents other noncurrent assets.</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_OtherAssetsAxis" xlink:label="loc_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637" xlink:to="lab_ctas_OtherAssetsAxis_7AC1C547AD7B27CFEFA98AD57621D637" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Assets [Domain]</link:label>
    <link:label id="lab_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE_label_en-US" xlink:label="lab_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Domain]</link:label>
    <link:label id="lab_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE_documentation_en-US" xlink:label="lab_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of other assets.</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_OtherAssetsDomain" xlink:label="loc_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE" xlink:to="lab_ctas_OtherAssetsDomain_E72A34A72E61B3950F3C8AD57621A9DE" xlink:type="arc" />
    <link:label id="lab_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816_verboseLabel_en-US" xlink:label="lab_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Capitalized contract costs</link:label>
    <link:label id="lab_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816_label_en-US" xlink:label="lab_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Capitalized Contract Cost [Member]</link:label>
    <link:label id="lab_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816_documentation_en-US" xlink:label="lab_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Capitalized Contract Cost [Member]</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_CapitalizedContractCostMember" xlink:label="loc_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816" xlink:to="lab_ctas_CapitalizedContractCostMember_D75D5E27DCDF5151F2DB8AD57622A816" xlink:type="arc" />
    <link:label id="lab_us-gaap_NoncompeteAgreementsMember_4E8016EB9020FA87A88A8AD5762219B7_terseLabel_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_4E8016EB9020FA87A88A8AD5762219B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Noncompete and consulting agreements</link:label>
    <link:label id="lab_us-gaap_NoncompeteAgreementsMember_4E8016EB9020FA87A88A8AD5762219B7_label_en-US" xlink:label="lab_us-gaap_NoncompeteAgreementsMember_4E8016EB9020FA87A88A8AD5762219B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Noncompete Agreements [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncompeteAgreementsMember" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_4E8016EB9020FA87A88A8AD5762219B7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NoncompeteAgreementsMember_4E8016EB9020FA87A88A8AD5762219B7" xlink:to="lab_us-gaap_NoncompeteAgreementsMember_4E8016EB9020FA87A88A8AD5762219B7" xlink:type="arc" />
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0_terseLabel_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0_label_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Miscellaneous Assets [Member]</link:label>
    <link:label id="lab_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0_documentation_en-US" xlink:label="lab_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents details of assets, which have not been itemized or categorized in footnotes to financial statements and are a component of other assets.</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_OtherMiscellaneousAssetsMember" xlink:label="loc_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0" xlink:to="lab_ctas_OtherMiscellaneousAssetsMember_DE1E78C021A05B2488038AD57622D8B0" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Information regarding service contracts and other assets</link:label>
    <link:label id="lab_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E_label_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets [Line Items]</link:label>
    <link:label id="lab_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E_documentation_en-US" xlink:label="lab_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="ctas-20190531.xsd#ctas_OtherAssetsLineItems" xlink:label="loc_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E" xlink:to="lab_ctas_OtherAssetsLineItems_588488CBC94E91428D628AD576228C4E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_9F5EC5012B7A65E06DE98AD5762323D9_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_9F5EC5012B7A65E06DE98AD5762323D9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts, carrying amount</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsGross_9F5EC5012B7A65E06DE98AD5762323D9_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsGross_9F5EC5012B7A65E06DE98AD5762323D9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_9F5EC5012B7A65E06DE98AD5762323D9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsGross_9F5EC5012B7A65E06DE98AD5762323D9" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsGross_9F5EC5012B7A65E06DE98AD5762323D9" xlink:type="arc" />
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D3AAB01A6C6CE2F03D128AD5762306D0_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D3AAB01A6C6CE2F03D128AD5762306D0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service contracts, accumulated amortization</link:label>
    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D3AAB01A6C6CE2F03D128AD5762306D0_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D3AAB01A6C6CE2F03D128AD5762306D0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Accumulated Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D3AAB01A6C6CE2F03D128AD5762306D0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D3AAB01A6C6CE2F03D128AD5762306D0" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_D3AAB01A6C6CE2F03D128AD5762306D0" xlink:type="arc" />
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsNet_C5EF1D048191C9971ED68AD57623C40A_label_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsNet_C5EF1D048191C9971ED68AD57623C40A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Finite-Lived Intangible Assets, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_C5EF1D048191C9971ED68AD57623C40A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_C5EF1D048191C9971ED68AD57623C40A" xlink:to="lab_us-gaap_FiniteLivedIntangibleAssetsNet_C5EF1D048191C9971ED68AD57623C40A" xlink:type="arc" />
    <link:label id="lab_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C_terseLabel_en-US" xlink:label="lab_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other assets, carrying amount</link:label>
    <link:label id="lab_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C_label_en-US" xlink:label="lab_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Gross</link:label>
    <link:label id="lab_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C_documentation_en-US" xlink:label="lab_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the gross carrying amount, as of the balance sheet date, of finite-lived assets and other noncurrent assets.</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_OtherAssetsGross" xlink:label="loc_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C" xlink:to="lab_ctas_OtherAssetsGross_7DE61E780ACFF20DD2B88AD57623CE4C" xlink:type="arc" />
    <link:label id="lab_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD_terseLabel_en-US" xlink:label="lab_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other assets, accumulated amortization</link:label>
    <link:label id="lab_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD_label_en-US" xlink:label="lab_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Amortization of Other Assets</link:label>
    <link:label id="lab_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD_documentation_en-US" xlink:label="lab_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the accumulated amortization of finite-lived assets and other noncurrent assets.</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_AccumulatedAmortizationOfOtherAssets" xlink:label="loc_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD" xlink:to="lab_ctas_AccumulatedAmortizationOfOtherAssets_5D1519EFFF3816A9D07F8AD5762461FD" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_93F186F0DA3A928BA25C8AD57624AFCF_totalLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_93F186F0DA3A928BA25C8AD57624AFCF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Other assets, net</link:label>
    <link:label id="lab_us-gaap_OtherAssetsNoncurrent_93F186F0DA3A928BA25C8AD57624AFCF_label_en-US" xlink:label="lab_us-gaap_OtherAssetsNoncurrent_93F186F0DA3A928BA25C8AD57624AFCF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_93F186F0DA3A928BA25C8AD57624AFCF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_93F186F0DA3A928BA25C8AD57624AFCF" xlink:to="lab_us-gaap_OtherAssetsNoncurrent_93F186F0DA3A928BA25C8AD57624AFCF" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAssetsCurrent_980C7C74BE25E5137D8D8AD576241471_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_980C7C74BE25E5137D8D8AD576241471" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current portion of capitalized contract costs</link:label>
    <link:label id="lab_us-gaap_OtherAssetsCurrent_980C7C74BE25E5137D8D8AD576241471_label_en-US" xlink:label="lab_us-gaap_OtherAssetsCurrent_980C7C74BE25E5137D8D8AD576241471" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_980C7C74BE25E5137D8D8AD576241471" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAssetsCurrent_980C7C74BE25E5137D8D8AD576241471" xlink:to="lab_us-gaap_OtherAssetsCurrent_980C7C74BE25E5137D8D8AD576241471" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_2C6E4F223E9FD4D8E7A705CA51C29175_terseLabel_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_2C6E4F223E9FD4D8E7A705CA51C29175" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principles of consolidation</link:label>
    <link:label id="lab_us-gaap_ConsolidationPolicyTextBlock_2C6E4F223E9FD4D8E7A705CA51C29175_label_en-US" xlink:label="lab_us-gaap_ConsolidationPolicyTextBlock_2C6E4F223E9FD4D8E7A705CA51C29175" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Consolidation, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_2C6E4F223E9FD4D8E7A705CA51C29175" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConsolidationPolicyTextBlock_2C6E4F223E9FD4D8E7A705CA51C29175" xlink:to="lab_us-gaap_ConsolidationPolicyTextBlock_2C6E4F223E9FD4D8E7A705CA51C29175" xlink:type="arc" />
    <link:label id="lab_us-gaap_UseOfEstimates_31F118FB7AA30E5F23E105CA51C20B00_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_31F118FB7AA30E5F23E105CA51C20B00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Use of estimates</link:label>
    <link:label id="lab_us-gaap_UseOfEstimates_31F118FB7AA30E5F23E105CA51C20B00_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_31F118FB7AA30E5F23E105CA51C20B00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_31F118FB7AA30E5F23E105CA51C20B00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UseOfEstimates_31F118FB7AA30E5F23E105CA51C20B00" xlink:to="lab_us-gaap_UseOfEstimates_31F118FB7AA30E5F23E105CA51C20B00" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_CA4B2B4F4F07E31F191005CA51C2F5AD_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_CA4B2B4F4F07E31F191005CA51C2F5AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue recognition</link:label>
    <link:label id="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_CA4B2B4F4F07E31F191005CA51C2F5AD_label_en-US" xlink:label="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_CA4B2B4F4F07E31F191005CA51C2F5AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue from Contract with Customer [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerPolicyTextBlock" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_CA4B2B4F4F07E31F191005CA51C2F5AD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_CA4B2B4F4F07E31F191005CA51C2F5AD" xlink:to="lab_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_CA4B2B4F4F07E31F191005CA51C2F5AD" xlink:type="arc" />
    <link:label id="lab_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F_terseLabel_en-US" xlink:label="lab_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of uniform rental and facility services</link:label>
    <link:label id="lab_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F_label_en-US" xlink:label="lab_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Rental Uniforms and Facility Services [Policy Text Block]</link:label>
    <link:label id="lab_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F_documentation_en-US" xlink:label="lab_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cost of Rental Uniforms and Facility Services[Policy Text Block]</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock" xlink:label="loc_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F" xlink:to="lab_ctas_CostofRentalUniformsandFacilityServicesPolicyTextBlock_1A884617C82CC9D6456905CA51C2342F" xlink:type="arc" />
    <link:label id="lab_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C_terseLabel_en-US" xlink:label="lab_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cost of other</link:label>
    <link:label id="lab_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C_label_en-US" xlink:label="lab_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cost of Other Services [Policy Text Block]</link:label>
    <link:label id="lab_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C_documentation_en-US" xlink:label="lab_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Cost of Other Services [Policy Text Block]</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_CostOfOtherServicesPolicyTextBlock" xlink:label="loc_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C" xlink:to="lab_ctas_CostOfOtherServicesPolicyTextBlock_501DDBD3F659AA1BF2A305CA51C2D77C" xlink:type="arc" />
    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_39B4F5302D5C54CDACDB05CA51C39A14_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_39B4F5302D5C54CDACDB05CA51C39A14" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Selling and administrative expenses</link:label>
    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_39B4F5302D5C54CDACDB05CA51C39A14_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_39B4F5302D5C54CDACDB05CA51C39A14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, General and Administrative Expenses, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_39B4F5302D5C54CDACDB05CA51C39A14" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_39B4F5302D5C54CDACDB05CA51C39A14" xlink:to="lab_us-gaap_SellingGeneralAndAdministrativeExpensesPolicyTextBlock_39B4F5302D5C54CDACDB05CA51C39A14" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_80D28D33D9A0E71CC8C805CA51C395FD_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_80D28D33D9A0E71CC8C805CA51C395FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_80D28D33D9A0E71CC8C805CA51C395FD_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_80D28D33D9A0E71CC8C805CA51C395FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_80D28D33D9A0E71CC8C805CA51C395FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsPolicyTextBlock_80D28D33D9A0E71CC8C805CA51C395FD" xlink:to="lab_us-gaap_CashAndCashEquivalentsPolicyTextBlock_80D28D33D9A0E71CC8C805CA51C395FD" xlink:type="arc" />
    <link:label id="lab_us-gaap_MarketableSecuritiesPolicy_0861E04C4D85E1FE81DA05CA51C3E3AD_terseLabel_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesPolicy_0861E04C4D85E1FE81DA05CA51C3E3AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
    <link:label id="lab_us-gaap_MarketableSecuritiesPolicy_0861E04C4D85E1FE81DA05CA51C3E3AD_label_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesPolicy_0861E04C4D85E1FE81DA05CA51C3E3AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Marketable Securities, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MarketableSecuritiesPolicy" xlink:label="loc_us-gaap_MarketableSecuritiesPolicy_0861E04C4D85E1FE81DA05CA51C3E3AD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MarketableSecuritiesPolicy_0861E04C4D85E1FE81DA05CA51C3E3AD" xlink:to="lab_us-gaap_MarketableSecuritiesPolicy_0861E04C4D85E1FE81DA05CA51C3E3AD" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReceivablesPolicyTextBlock_29FB988EE6CEBB8975FF05CA51C3CD1A_terseLabel_en-US" xlink:label="lab_us-gaap_ReceivablesPolicyTextBlock_29FB988EE6CEBB8975FF05CA51C3CD1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable</link:label>
    <link:label id="lab_us-gaap_ReceivablesPolicyTextBlock_29FB988EE6CEBB8975FF05CA51C3CD1A_label_en-US" xlink:label="lab_us-gaap_ReceivablesPolicyTextBlock_29FB988EE6CEBB8975FF05CA51C3CD1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivable [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReceivablesPolicyTextBlock" xlink:label="loc_us-gaap_ReceivablesPolicyTextBlock_29FB988EE6CEBB8975FF05CA51C3CD1A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReceivablesPolicyTextBlock_29FB988EE6CEBB8975FF05CA51C3CD1A" xlink:to="lab_us-gaap_ReceivablesPolicyTextBlock_29FB988EE6CEBB8975FF05CA51C3CD1A" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryPolicyTextBlock_B63CC3978A9DE1CFAEB505CA51C3851F_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_B63CC3978A9DE1CFAEB505CA51C3851F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories, net</link:label>
    <link:label id="lab_us-gaap_InventoryPolicyTextBlock_B63CC3978A9DE1CFAEB505CA51C3851F_label_en-US" xlink:label="lab_us-gaap_InventoryPolicyTextBlock_B63CC3978A9DE1CFAEB505CA51C3851F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryPolicyTextBlock" xlink:label="loc_us-gaap_InventoryPolicyTextBlock_B63CC3978A9DE1CFAEB505CA51C3851F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryPolicyTextBlock_B63CC3978A9DE1CFAEB505CA51C3851F" xlink:to="lab_us-gaap_InventoryPolicyTextBlock_B63CC3978A9DE1CFAEB505CA51C3851F" xlink:type="arc" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_49001F64E168D2AEB89E0B2D396C3671" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_49001F64E168D2AEB89E0B2D396C3671" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_49001F64E168D2AEB89E0B2D396C3671" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A1CA82642B3E9614105A0B2D396CBC3B_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A1CA82642B3E9614105A0B2D396CBC3B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Accounts receivable, net</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A1CA82642B3E9614105A0B2D396CBC3B_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A1CA82642B3E9614105A0B2D396CBC3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Receivable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_A1CA82642B3E9614105A0B2D396CBC3B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_A1CA82642B3E9614105A0B2D396CBC3B" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsReceivable_A1CA82642B3E9614105A0B2D396CBC3B" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_D2D90CFCB7DDD088F3850B2D396C0B60_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_D2D90CFCB7DDD088F3850B2D396C0B60" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Inventories, net</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInInventories_D2D90CFCB7DDD088F3850B2D396C0B60_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInInventories_D2D90CFCB7DDD088F3850B2D396C0B60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Inventories</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_D2D90CFCB7DDD088F3850B2D396C0B60" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInInventories_D2D90CFCB7DDD088F3850B2D396C0B60" xlink:to="lab_us-gaap_IncreaseDecreaseInInventories_D2D90CFCB7DDD088F3850B2D396C0B60" xlink:type="arc" />
    <link:label id="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_0EA640791E111B371AE90B2D396CD2B6_negatedLabel_en-US" xlink:label="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_0EA640791E111B371AE90B2D396CD2B6" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Uniforms and other rental items in service</link:label>
    <link:label id="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_0EA640791E111B371AE90B2D396CD2B6_label_en-US" xlink:label="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_0EA640791E111B371AE90B2D396CD2B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Uniforms and Other Rental Items in Service</link:label>
    <link:label id="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_0EA640791E111B371AE90B2D396CD2B6_documentation_en-US" xlink:label="lab_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_0EA640791E111B371AE90B2D396CD2B6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">This element represents the increase (decrease) in cash flows related to uniforms and other rental items in service for the current reporting year.</link:label>
    <link:loc xlink:href="ctas-20190531.xsd#ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService" xlink:label="loc_ctas_IncreaseDecreaseInUniformsAndOtherRentalItemsInService_0EA640791E111B371AE90B2D396CD2B6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42715785E5FDA3A494F90B2D396DC0C9_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42715785E5FDA3A494F90B2D396DC0C9" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses and other current assets and capitalized contract costs</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42715785E5FDA3A494F90B2D396DC0C9_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42715785E5FDA3A494F90B2D396DC0C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Prepaid Expense and Other Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42715785E5FDA3A494F90B2D396DC0C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42715785E5FDA3A494F90B2D396DC0C9" xlink:to="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_42715785E5FDA3A494F90B2D396DC0C9" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_FB95A5F3DC32ED77BF5D0B2D396DC5DD_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_FB95A5F3DC32ED77BF5D0B2D396DC5DD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayable_FB95A5F3DC32ED77BF5D0B2D396DC5DD_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayable_FB95A5F3DC32ED77BF5D0B2D396DC5DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Payable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_FB95A5F3DC32ED77BF5D0B2D396DC5DD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsPayable_FB95A5F3DC32ED77BF5D0B2D396DC5DD" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsPayable_FB95A5F3DC32ED77BF5D0B2D396DC5DD" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_ED2A4B75BCA7136D99E60B2D396DEB91_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_ED2A4B75BCA7136D99E60B2D396DEB91" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued compensation and related liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_ED2A4B75BCA7136D99E60B2D396DEB91_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_ED2A4B75BCA7136D99E60B2D396DEB91" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Employee Related Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_ED2A4B75BCA7136D99E60B2D396DEB91" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_ED2A4B75BCA7136D99E60B2D396DEB91" xlink:to="lab_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_ED2A4B75BCA7136D99E60B2D396DEB91" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_E93E1688680DFA0A453C0B2D396DB32B_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_E93E1688680DFA0A453C0B2D396DB32B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued liabilities and other</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_E93E1688680DFA0A453C0B2D396DB32B_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_E93E1688680DFA0A453C0B2D396DB32B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accrued Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_E93E1688680DFA0A453C0B2D396DB32B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_E93E1688680DFA0A453C0B2D396DB32B" xlink:to="lab_us-gaap_IncreaseDecreaseInAccruedLiabilities_E93E1688680DFA0A453C0B2D396DB32B" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_777E41A5F498AD01DF300B2D396D8DDB_verboseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_777E41A5F498AD01DF300B2D396D8DDB" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Income taxes, current</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_777E41A5F498AD01DF300B2D396D8DDB_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_777E41A5F498AD01DF300B2D396D8DDB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_777E41A5F498AD01DF300B2D396D8DDB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_777E41A5F498AD01DF300B2D396D8DDB" xlink:to="lab_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_777E41A5F498AD01DF300B2D396D8DDB" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_33EEC64750E8C05317070B2D396DCEC0_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_33EEC64750E8C05317070B2D396DCEC0" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_33EEC64750E8C05317070B2D396DCEC0_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_33EEC64750E8C05317070B2D396DCEC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_33EEC64750E8C05317070B2D396DCEC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_33EEC64750E8C05317070B2D396DCEC0" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_33EEC64750E8C05317070B2D396DCEC0" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9694F99823F8FA3C5DF30B471E800B1A_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9694F99823F8FA3C5DF30B471E800B1A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9694F99823F8FA3C5DF30B471E800B1A_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9694F99823F8FA3C5DF30B471E800B1A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9694F99823F8FA3C5DF30B471E800B1A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9694F99823F8FA3C5DF30B471E800B1A" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9694F99823F8FA3C5DF30B471E800B1A" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8C6F38359BD0B1216CD90B471E899AA3_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8C6F38359BD0B1216CD90B471E899AA3" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8C6F38359BD0B1216CD90B471E899AA3_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8C6F38359BD0B1216CD90B471E899AA3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8C6F38359BD0B1216CD90B471E899AA3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8C6F38359BD0B1216CD90B471E899AA3" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_8C6F38359BD0B1216CD90B471E899AA3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_ABD25477178D2610ED140B471E89B977_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_ABD25477178D2610ED140B471E89B977" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from redemption of marketable securities and investments</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_ABD25477178D2610ED140B471E89B977_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_ABD25477178D2610ED140B471E89B977" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale and Maturity of Marketable Securities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_ABD25477178D2610ED140B471E89B977" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_ABD25477178D2610ED140B471E89B977" xlink:to="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_ABD25477178D2610ED140B471E89B977" xlink:type="arc" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireInvestments_EFEA57921ADB30EAE4970B471E8931A0_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireInvestments_EFEA57921ADB30EAE4970B471E8931A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Investments</link:label>
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