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Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) (USD $) In Thousands, unless otherwise specified | Feb. 28, 2015 | May 31, 2014
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Information regarding service contracts and other assets |  |
Service contracts, net | $ 44,824 us-gaap_FiniteLivedIntangibleAssetsNet | $ 55,675 us-gaap_FiniteLivedIntangibleAssetsNet
Other assets, carrying amount | 65,537 ctas_OtherAssetsGross | 72,906 ctas_OtherAssetsGross
Other assets, accumulated amortization | 47,458 ctas_AccumulatedAmortizationOfOtherAssets | 53,280 ctas_AccumulatedAmortizationOfOtherAssets
Other assets, net | 18,079 us-gaap_OtherAssetsNoncurrent | 19,626 us-gaap_OtherAssetsNoncurrent
Noncompete and consulting agreements |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 41,709 ctas_OtherAssetsGross / ctas_OtherAssetsAxis = us-gaap_NoncompeteAgreementsMember | 49,080 ctas_OtherAssetsGross / ctas_OtherAssetsAxis = us-gaap_NoncompeteAgreementsMember
Other assets, accumulated amortization | 40,127 ctas_AccumulatedAmortizationOfOtherAssets / ctas_OtherAssetsAxis = us-gaap_NoncompeteAgreementsMember | 47,036 ctas_AccumulatedAmortizationOfOtherAssets / ctas_OtherAssetsAxis = us-gaap_NoncompeteAgreementsMember
Other assets, net | 1,582 us-gaap_OtherAssetsNoncurrent / ctas_OtherAssetsAxis = us-gaap_NoncompeteAgreementsMember | 2,044 us-gaap_OtherAssetsNoncurrent / ctas_OtherAssetsAxis = us-gaap_NoncompeteAgreementsMember
Other |  |
Information regarding service contracts and other assets |  |
Other assets, carrying amount | 23,828 ctas_OtherAssetsGross / ctas_OtherAssetsAxis = ctas_OtherMiscellaneousAssetsMember | 23,826 ctas_OtherAssetsGross / ctas_OtherAssetsAxis = ctas_OtherMiscellaneousAssetsMember
Other assets, accumulated amortization | 7,331 ctas_AccumulatedAmortizationOfOtherAssets / ctas_OtherAssetsAxis = ctas_OtherMiscellaneousAssetsMember | 6,244 ctas_AccumulatedAmortizationOfOtherAssets / ctas_OtherAssetsAxis = ctas_OtherMiscellaneousAssetsMember
Other assets, net | 16,497 us-gaap_OtherAssetsNoncurrent / ctas_OtherAssetsAxis = ctas_OtherMiscellaneousAssetsMember | 17,582 us-gaap_OtherAssetsNoncurrent / ctas_OtherAssetsAxis = ctas_OtherMiscellaneousAssetsMember
Service Contracts |  |
Information regarding service contracts and other assets |  |
Service contracts, carrying amount | 340,002 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServiceAgreementsMember | 360,634 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServiceAgreementsMember
Service contracts, accumulated amortization | 295,178 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServiceAgreementsMember | 304,959 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServiceAgreementsMember
Service contracts, net | $ 44,824 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServiceAgreementsMember | $ 55,675 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ServiceAgreementsMember

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