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Earnings Per Share - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 1 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2014 | Nov. 30, 2013 | Jan. 09, 2015 | Jan. 09, 2015 | Jul. 30, 2013
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Basic earnings per share, discontinued operations (dollars per share) | $ 0.15 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.15 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  |  |
Diluted earnings per share, discontinued operations (dollars per share) | $ 0.14 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.14 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  |  |
Basic and Diluted earnings per share from discontinued operations (shares) |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare |  | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare |  |  |
Options granted and excluded from the computation of diluted earnings per share (shares) | 500,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 500,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 600,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 700,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |
Common Stock |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Common stock purchased under a share buyback program (shares) | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 800,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Aggregate purchase price of common stock under a share buyback program |  |  | $ 49.7 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Average price of common stock purchased under a share buyback program (dollars per share) |  |  | $ 62.17 ctas_StockRepurchasedDuringPeriodAveragePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Common Stock | Employee payroll taxes due on restricted stock |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Common stock purchased under a share buyback program (shares) |  |  | 200,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ctas_EmployeePayrollTaxesDueOnRestrictedStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Aggregate purchase price of common stock under a share buyback program | 2.2 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ctas_EmployeePayrollTaxesDueOnRestrictedStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 13.9 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ctas_EmployeePayrollTaxesDueOnRestrictedStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Average price of common stock purchased under a share buyback program (dollars per share) |  |  | $ 64.07 ctas_StockRepurchasedDuringPeriodAveragePrice / us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis = ctas_EmployeePayrollTaxesDueOnRestrictedStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Common stock purchased under a share buyback program (shares) |  |  |  |  | 0 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 4,100,000 us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Aggregate purchase price of common stock under a share buyback program |  |  |  |  |  | $ 249.2 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Average price of common stock purchased under a share buyback program (dollars per share) |  |  |  |  |  | $ 60.19 ctas_StockRepurchasedDuringPeriodAveragePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
July 30, 2013 |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |  |  |  |
Additional amount authorized under share buyback program (shares) |  |  |  |  |  |  | 500,000,000 ctas_StockRepurchaseProgramNewAuthorizedAmount / us-gaap_PlanNameAxis = ctas_BuybackProgramJuly2013Member

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