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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2014 | Nov. 30, 2013
Equity [Abstract] |  |  |  |
Amortization of interest rate locks | $ (783)ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsbeforeTax | $ (783)ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsbeforeTax | $ (1,565)ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsbeforeTax | $ (1,565)ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsbeforeTax
Tax benefit | 295 ctas_OtherComprehensiveIncomeLossOtherAdjustmentsTax | 295 ctas_OtherComprehensiveIncomeLossOtherAdjustmentsTax | 589 ctas_OtherComprehensiveIncomeLossOtherAdjustmentsTax | 589 ctas_OtherComprehensiveIncomeLossOtherAdjustmentsTax
Amortization of interest rate locks, net of tax | $ (488)ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsNetofTax | $ (488)ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsNetofTax | $ (976)ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsNetofTax | $ (976)ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsNetofTax

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- Definition Other Comprehensive Income (Loss), Amortization of Interest Rate Lock Agreements, before Tax + References No definition available. + Details
Name: | ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsbeforeTax
Namespace Prefix: | ctas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Other Comprehensive Income (Loss), Amortization of Interest Rate Lock Agreements, Net of Tax + References No definition available. + Details
Name: | ctas_OtherComprehensiveIncomeLossAmortizationofInterestRateLockAgreementsNetofTax
Namespace Prefix: | ctas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Other Comprehensive Income (Loss), Other Adjustments, Tax + References No definition available. + Details
Name: | ctas_OtherComprehensiveIncomeLossOtherAdjustmentsTax
Namespace Prefix: | ctas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration