XML 58 R47.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Goodwill, Service Contracts and Other Assets - Changes in Carrying Amount of Service Contracts by Operating Segment (Details) $ in Thousands | 6 Months Ended
--- | ---
Nov. 30, 2018 USD ($)
Service contracts [Roll Forward] |
Beginning balance | $ 545,768
Service contracts acquired | 5,712
Service contracts amortization | (28,083)
Foreign currency translation | (1,892)
Ending balance | 521,505
Uniform Rental and Facility Services |
Service contracts [Roll Forward] |
Beginning balance | 492,067
Service contracts acquired | 739
Service contracts amortization | (23,477)
Foreign currency translation | (1,845)
Ending balance | 467,484
First Aid and Safety Services |
Service contracts [Roll Forward] |
Beginning balance | 27,294
Service contracts acquired | 14
Service contracts amortization | (1,926)
Foreign currency translation | (47)
Ending balance | 25,335
All Other |
Service contracts [Roll Forward] |
Beginning balance | 26,407
Service contracts acquired | 4,959
Service contracts amortization | (2,680)
Foreign currency translation | 0
Ending balance | $ 28,686

X
- Definition Amount of reduction of finite-lived intangible assets due to amortization during the period. + References No definition available. + Details
Name: | ctas_FiniteLivedIntangibleAssetsAmortization
Namespace Prefix: | ctas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
Name: | us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ctas_UniformRentalandFacilityServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ctas_FirstAidandSafetyServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |