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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
Basic Earnings per Share from Continuing Operations        
Income from continuing operations $ 103,446us-gaap_IncomeLossFromContinuingOperations $ 84,456us-gaap_IncomeLossFromContinuingOperations $ 213,237us-gaap_IncomeLossFromContinuingOperations $ 161,854us-gaap_IncomeLossFromContinuingOperations
Less: income from continuing operations allocated to participating securities 880ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 16ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 1,493ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 477ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted
Income from continuing operations available to common shareholders 102,566ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities 84,440ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities 211,744ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities 161,377ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities
Basic weighted average common shares outstanding (shares) 117,115us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 119,907us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,887us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 121,025us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per common share:        
Basic earnings per share, continuing operations (dollars per share) $ 0.87us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.70us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.81us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.33us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted Earnings per Share from Continuing Operations        
Income from continuing operations 103,446us-gaap_IncomeLossFromContinuingOperations 84,456us-gaap_IncomeLossFromContinuingOperations 213,237us-gaap_IncomeLossFromContinuingOperations 161,854us-gaap_IncomeLossFromContinuingOperations
Less: income from continuing operations allocated to participating securities 880ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 16ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 1,493ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 477ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted
Income from continuing operations available to common shareholders $ 102,566ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities $ 84,440ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities $ 211,744ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities $ 161,377ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities
Basic weighted average common shares outstanding (shares) 117,115us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 119,907us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,887us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 121,025us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities - employee stock options & awards (shares) 1,540us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,143us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,447us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 991us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average common shares outstanding (shares) 118,655us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 121,050us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 118,334us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 122,016us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share:        
Diluted earnings per share, continuing operations (dollars per share) $ 0.86us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.69us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.79us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.32us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare