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Discontinued Operations - Narrative (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2015 buyer transaction | Feb. 28, 2014 | Feb. 28, 2015
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 |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Cash proceeds received, net of cash contributed | $ 154,891 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | $ 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested |
Discontinued Operations | Storage Business |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Cash proceeds received, net of cash contributed | $ 154,900 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / ctas_DisposalGroupClassificationAxis = us-gaap_SegmentDiscontinuedOperationsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = ctas_DocumentImagingandDocumentRetentionServicesMember |  | $ 900 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / ctas_DisposalGroupClassificationAxis = us-gaap_SegmentDiscontinuedOperationsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = ctas_DocumentImagingandDocumentRetentionServicesMember

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- Definition Discontinued Operations, Number of Buyers Involved in Sale of Business + References No definition available. + Details
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- Definition Discontinued Operations, Number of Transactions Involved in Sale of Business + References No definition available. + Details
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- Details
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- Details
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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
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