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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 9 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Basic Earnings per Share from Continuing Operations        
Income from continuing operations $ 93,636us-gaap_IncomeLossFromContinuingOperations $ 84,326us-gaap_IncomeLossFromContinuingOperations $ 306,873us-gaap_IncomeLossFromContinuingOperations $ 246,180us-gaap_IncomeLossFromContinuingOperations
Less: income from continuing operations allocated to participating securities 951ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 740ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 2,444ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 1,217ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted
Income from continuing operations available to common shareholders 92,685ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities 83,586ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities 304,429ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities 244,963ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities
Basic weighted average common shares outstanding (shares) 116,178us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 119,913us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,653us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 120,658us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per common share:        
Basic earnings per share, continuing operations (dollars per share) $ 0.80us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.70us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.61us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.03us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted Earnings per Share from Continuing Operations        
Income from continuing operations 93,636us-gaap_IncomeLossFromContinuingOperations 84,326us-gaap_IncomeLossFromContinuingOperations 306,873us-gaap_IncomeLossFromContinuingOperations 246,180us-gaap_IncomeLossFromContinuingOperations
Less: income from continuing operations allocated to participating securities 951ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 740ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 2,444ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted 1,217ctas_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted
Income from continuing operations available to common shareholders $ 92,685ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities $ 83,586ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities $ 304,429ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities $ 244,963ctas_NetIncomeLossAvailableToCommonStockholdersBasicAfterAdjustmentOfUndistributedEarningsAllocatedToParticipatingSecurities
Basic weighted average common shares outstanding (shares) 116,178us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 119,913us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 116,653us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 120,658us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities - employee stock options & awards (shares) 1,689us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,367us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,561us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,156us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average common shares outstanding (shares) 117,867us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 121,280us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 118,214us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 121,814us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share:        
Diluted earnings per share, continuing operations (dollars per share) $ 0.79us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.69us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.58us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.01us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare