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Goodwill, Service Contracts and Other Assets - Estimated Future Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2019 | Aug. 31, 2018
Goodwill, Service Contracts and Other Assets [Abstract] |  |
Amortization expense for service contracts and other assets | $ 34,600 | $ 33,000
2020 (remaining nine months) | 100,846 |
2021 | 120,954 |
2022 | 109,078 |
2023 | 90,379 |
2024 | 79,144 |
Thereafter | 274,800 |
Total future amortization expense | $ 775,201 |

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- Definition Finite-Lived Intangible Assets, Net, And Other Assets + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Finite-Lived Intangible Assets, Net, And Other Assets, Amortization Expense, After Year Five + References No definition available. + Details
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Namespace Prefix: | ctas_
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- Definition Finite-Lived Intangible Assets, Net, And Other Assets, Amortization Expense, Remainder Of Fiscal Year + References No definition available. + Details
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- Definition Finite-Lived Intangible Assets, Net, And Other Assets, Amortization Expense, Year Five + References No definition available. + Details
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- Definition Finite-Lived Intangible Assets, Net, And Other Assets, Amortization Expense, Year Four + References No definition available. + Details
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- Definition Finite-Lived Intangible Assets, Net, And Other Assets, Amortization Expense, Year Three + References No definition available. + Details
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- Definition Finite-Lived Intangible Assets, Net, And Other Assets, Amortization Expense, Year Two + References No definition available. + Details
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Namespace Prefix: | ctas_
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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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