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Goodwill, Service Contracts and Other Assets - Changes in Carrying Amount of Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Nov. 30, 2014
Goodwill [Roll Forward] |
Balance as of June 1, 2014 | $ 1,267,411 us-gaap_Goodwill
Goodwill acquired | 909 us-gaap_GoodwillAcquiredDuringPeriod
Goodwill divested in the Storage transactions | (75,660)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Foreign currency translation | (3,300)us-gaap_GoodwillTranslationAdjustments
Balance as of November 30, 2014 | 1,189,360 us-gaap_Goodwill
Rental Uniforms and Ancillary Products |
Goodwill [Roll Forward] |
Balance as of June 1, 2014 | 943,516 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ctas_RentalUniformsAndAncillaryProductsMember
Goodwill acquired | 70 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ctas_RentalUniformsAndAncillaryProductsMember
Goodwill divested in the Storage transactions | 0 us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = ctas_RentalUniformsAndAncillaryProductsMember
Foreign currency translation | (832)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ctas_RentalUniformsAndAncillaryProductsMember
Balance as of November 30, 2014 | 942,754 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ctas_RentalUniformsAndAncillaryProductsMember
Uniform Direct Sales |
Goodwill [Roll Forward] |
Balance as of June 1, 2014 | 23,905 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ctas_UniformDirectSalesMember
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ctas_UniformDirectSalesMember
Goodwill divested in the Storage transactions | 0 us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = ctas_UniformDirectSalesMember
Foreign currency translation | (49)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ctas_UniformDirectSalesMember
Balance as of November 30, 2014 | 23,856 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ctas_UniformDirectSalesMember
First Aid, Safety and Fire Protection |
Goodwill [Roll Forward] |
Balance as of June 1, 2014 | 221,911 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ctas_FirstAidSafetyAndFireProtectionMember
Goodwill acquired | 839 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ctas_FirstAidSafetyAndFireProtectionMember
Goodwill divested in the Storage transactions | 0 us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = ctas_FirstAidSafetyAndFireProtectionMember
Foreign currency translation | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = ctas_FirstAidSafetyAndFireProtectionMember
Balance as of November 30, 2014 | 222,750 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ctas_FirstAidSafetyAndFireProtectionMember
Corporate |
Goodwill [Roll Forward] |
Balance as of June 1, 2014 | 78,079 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Goodwill acquired | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Goodwill divested in the Storage transactions | (75,660)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Foreign currency translation | (2,419)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Balance as of November 30, 2014 | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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