Cover Page - shares	9 Months Ended
	Feb. 28, 2021	Mar. 31, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Feb. 28, 2021
Document Transition Report	false
Entity File Number	0-11399
Entity Registrant Name	Cintas Corporation
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		105,053,197
Amendment Flag	false
Entity Central Index Key	0000723254
Current Fiscal Year End Date	--05-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3