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Discontinued Operations - Narrative (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Nov. 30, 2014 buyer transactions | Nov. 30, 2013
Discontinued Operations and Disposal Groups [Abstract] |  |
Number of transactions involved in sale of business | 3 ctas_DiscontinuedOperationsNumberofTransactionsInvolvedinSaleofBusiness |
Number of buyers involved in sale of business | 3 ctas_DiscontinuedOperationsNumberofBuyersInvolvedinSaleofBusiness |
Cash proceeds received, net of cash contributed | $ 153,996 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | $ 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested

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- Definition Discontinued Operations, Number of Buyers Involved in Sale of Business + References No definition available. + Details
Name: | ctas_DiscontinuedOperationsNumberofBuyersInvolvedinSaleofBusiness
Namespace Prefix: | ctas_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Discontinued Operations, Number of Transactions Involved in Sale of Business + References No definition available. + Details
Name: | ctas_DiscontinuedOperationsNumberofTransactionsInvolvedinSaleofBusiness
Namespace Prefix: | ctas_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration