XML 68 R53.htm IDEA: XBRL DOCUMENT
v3.19.2

Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2019 | May 31, 2018 | May 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred commissions current | $ 69.6 |  |
Deferred commissions noncurrent | 206.0 |  |
Amortization of deferred commissions | $ 71.1 |  |
Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 100.00% | 100.00% | 100.00%
Uniform rental and facility services | Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 80.60% | 81.00% | 78.90%
Uniform rental and facility services | Transferred over Time | Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 95.60% | 95.40% | 94.90%
First Aid and Safety Services | Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 9.00% | 8.70% | 9.50%
First Aid and Safety Services | Transferred over Time | Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 90.50% | 90.50% | 90.60%
Fire Protection Services | Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 5.90% | 5.40% | 5.90%
Fire Protection Services | Transferred over Time | Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) |  | 100.00% | 100.00%
Fire Protection Services | Transferred over Time | Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 100.00% |  |
Uniform Direct Sales | Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 4.50% | 4.90% | 5.70%
Uniform Direct Sales | Transferred at Point in Time | Revenue | Product concentration risk |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 96.50% | 96.90% | 96.90%
Uniform Rental and Facility Services, First Aid and Safety Services and Fire Protection Services | Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 95.00% |  |
Uniform Direct Sales | Revenue |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Concentration risk (as a percent) | 5.00% |  |

X
- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
Name: | us-gaap_CapitalizedContractCostAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
Name: | us-gaap_CapitalizedContractCostNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as noncurrent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
Name: | us-gaap_CapitalizedContractCostNetNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_ProductConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredOverTimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ProductOrServiceAxis=ctas_FireProtectionServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ctas_UniformDirectSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredAtPointInTimeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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