Cover - USD ($)	12 Months Ended
	May 31, 2022	Jun. 30, 2022	Nov. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	May 31, 2022
Current Fiscal Year End Date	--05-31
Document Transition Report	false
Entity File Number	0-11399
Entity Registrant Name	Cintas Corp
Entity Incorporation, State or Country Code	WA
Entity Tax Identification Number	31-1188630
Entity Address, Address Line One	6800 Cintas Boulevard
Entity Address, Address Line Two	P.O. Box 625737
Entity Address, City or Town	Cincinnati,
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45262-5737
City Area Code	(513)
Local Phone Number	459-1200
Title of 12(b) Security	Common stock, no par value
Trading Symbol	CTAS
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
ICFR Auditor Attestation Flag	true
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 43,766,089,501
Entity Common Stock, Shares Outstanding		101,188,086
Documents Incorporated by Reference	Portions of the Registrant's Proxy Statement to be filed with the Commission for its 2022 Annual Meeting of Shareholders are incorporated by reference in Part III of this Form 10-K.
Amendment Flag	false
Entity CIK	0000723254
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY