XML 82 R67.htm IDEA: XBRL DOCUMENT
v3.22.2

Income Taxes - Summary of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2022 | May 31, 2021
Movement in Valuation Allowance [Roll Forward] |  |
Balance at beginning of year | $ (2,037) | $ (6,411)
Subtractions | 2,037 | 4,374
Balance at end of year | $ 0 | $ (2,037)

X
- Definition Deferred Tax Assets, Valuation Allowance, Subtractions + References No definition available. + Details
Name: | ctas_DeferredTaxAssetsValuationAllowanceSubtractions
Namespace Prefix: | ctas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Movement in Valuation Allowance [Roll Forward] + References No definition available. + Details
Name: | ctas_MovementinValuationAllowanceRollForward
Namespace Prefix: | ctas_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant