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Litigation and Other Contingencies (Details) (Serrano lawsuit) | 1 Months Ended
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Sep. 30, 2010 individual
Serrano lawsuit |
Loss Contingencies [Line Items] |
Number of plaintiffs (individual) | 13 us-gaap_LossContingencyNumberOfPlaintiffs / us-gaap_LitigationCaseAxis = ctas_SerranoPurportedClassActionLawsuitMember

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

X
- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration