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Earnings Per Share - Narrative (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 19 Months Ended | 1 Months Ended |  |
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Feb. 28, 2015 | Feb. 28, 2014 | Feb. 28, 2015 | Feb. 28, 2014 | Feb. 28, 2015 | Apr. 02, 2015 | Jul. 30, 2013 | Jan. 13, 2015
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |
Basic earnings per share, discontinued operations (dollars per share) | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.16 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  |  |  |
Diluted earnings per share, discontinued operations (dollars per share) | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.15 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  |  |  |
Options granted and excluded from the computation of diluted earnings per share (shares) | 0.4 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0.4 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0.7 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0.6 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |  |
Common stock purchased under share buyback | 3.2 us-gaap_TreasuryStockSharesAcquired |  | 4.0 us-gaap_TreasuryStockSharesAcquired |  | 7.3 us-gaap_TreasuryStockSharesAcquired |  |  |
Common stock purchased under a share buyback, average price per share | $ 78.84 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  | $ 75.49 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  | $ 68.28 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |
Aggregate purchase price of common stock under a share buyback program | $ 250.8 us-gaap_TreasuryStockValueAcquiredCostMethod |  | $ 300.5 us-gaap_TreasuryStockValueAcquiredCostMethod |  | $ 500.0 us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |
Employee payroll taxes due on restricted stock |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |
Common stock purchased under share buyback |  |  | 0.2 us-gaap_TreasuryStockSharesAcquired / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ctas_EmployeePayrollTaxesDueOnRestrictedStockMember |  |  |  |  |
Common stock purchased under a share buyback, average price per share |  |  | $ 64.32 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ctas_EmployeePayrollTaxesDueOnRestrictedStockMember |  |  |  |  |
Aggregate purchase price of common stock under a share buyback program | 0.2 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ctas_EmployeePayrollTaxesDueOnRestrictedStockMember |  | 14.1 us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ctas_EmployeePayrollTaxesDueOnRestrictedStockMember |  |  |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |
Common stock purchased under share buyback |  |  |  |  |  | 0 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
July 30, 2013 |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  | 500.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = ctas_BuybackProgramJuly2013Member |
January 13, 2015 |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  |  | $ 500.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = ctas_BuybackProgramJanuary2015Member

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