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Debt, Derivatives and Hedging Activities (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2011 | Nov. 30, 2010 | Nov. 30, 2011 | Nov. 30, 2010
Debt, Derivatives and Hedging Activities |  |  |  |
Commercial paper program availability | $ 300,000,000 |  | $ 300,000,000 |
Revolving credit facility, maximum borrowing capacity with accordion feature | 450,000,000 |  | 450,000,000 |
Debt, Derivatives and Hedging Activities |  |  |  |
Increase to other comprehensive income resulting from amortization of the interest rate lock agreements | $ 377,000 | $ 191,000 | $ 754,000 | $ 383,000
No more than |  |  |  |
Debt, Derivatives and Hedging Activities |  |  |  |
Numerator for the ratio of consolidated indebtedness to consolidated EBITDA |  |  | 3.5 |
Denominator for the ratio of consolidated indebtedness to consolidated EBITDA |  |  | 1.0 |

X
- Definition This element represents the maximum borrowing capacity under a commercial paper program. + References No definition available. + Details
Name: | ctas_CommercialPaperMaximumBorrowingCapacity
Namespace Prefix: | ctas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ctas_DebtDerivativesAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | ctas_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the denominator for the ratio of consolidated indebtedness to consolidated EBITDA (earnings before interest, taxes, depreciation and amortization) ratio permitted under financial covenants. + References No definition available. + Details
Name: | ctas_DebtInstrumentCovenantRatioConsolidatedIndebtednessToConsolidatedEBITDADenominator
Namespace Prefix: | ctas_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the numerator for the ratio of consolidated indebtedness to consolidated EBITDA (earnings before interest, taxes, depreciation and amortization) ratio permitted under financial covenants. + References No definition available. + Details
Name: | ctas_DebtInstrumentCovenantRatioConsolidatedIndebtednessToConsolidatedEBITDANumerator
Namespace Prefix: | ctas_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the increase in comprehensive income related to the amortization of an interest rate cash flow hedge. + References No definition available. + Details
Name: | ctas_OtherComprehensiveIncomeIncreaseFromAmortizationOfInterestRateCashFlowHedge
Namespace Prefix: | ctas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant