XML 68 R54.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Goodwill, Service Contracts and Other Assets - Changes in Carrying Amount of Service Contracts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | $ 586,988 | $ 78,194
Service contracts acquired | 9,393 | 529,235
Service contracts amortization | (54,044) | (20,510)
Foreign currency translation | 3,431 | 69
Balance at the end of the period | 545,768 | 586,988
Operating Segments | Uniform Rental and Facility Services |  |
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | 529,923 | 19,912
Service contracts acquired | 4,098 | 521,708
Service contracts amortization | (45,296) | (11,636)
Foreign currency translation | 3,342 | (61)
Balance at the end of the period | 492,067 | 529,923
Operating Segments | First Aid and Safety Services |  |
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | 30,062 | 32,252
Service contracts acquired | 985 | 1,632
Service contracts amortization | (3,842) | (3,952)
Foreign currency translation | 89 | 130
Balance at the end of the period | 27,294 | 30,062
Operating Segments | All Other |  |
Service contracts [Roll Forward] |  |
Balance at the beginning of the period | 27,003 | 26,030
Service contracts acquired | 4,310 | 5,895
Service contracts amortization | (4,906) | (4,922)
Foreign currency translation | 0 | 0
Balance at the end of the period | $ 26,407 | $ 27,003

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
- References No definition available. + Details
Name: | ctas_FiniteLivedIntangibleAssetsNetRollForward
Namespace Prefix: | ctas_
Data Type: | xbrli:stringItemType
Balance Type: | na
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 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: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |