Earnings per Share - Summary of Buyback Activity by Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		13 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022
Equity, Class of Treasury Stock [Line Items]
Stock purchased under share buyback	$ 320,334	$ 659,235
Shares acquired for taxes due (in shares)	270	198
Shares acquired for taxes due, average price (in dollars per share)	$ 405.93	$ 394.19
Shares acquired for taxes due	$ 109,583	$ 78,015
Total repurchase of Cintas common stock	$ 320,334	$ 659,235
Share Buyback Programs
Equity, Class of Treasury Stock [Line Items]
Stock purchased under share buyback (in shares)	532	1,590
Stock purchased under share buyback, average price (in dollars per share)	$ 396.39	$ 365.41
Stock purchased under share buyback	$ 210,751	$ 581,220
October 29, 2019 Plan
Equity, Class of Treasury Stock [Line Items]
Stock purchased under share buyback (in shares)	0	1,590
Stock purchased under share buyback, average price (in dollars per share)	$ 0	$ 365.41
Stock purchased under share buyback	$ 0	$ 581,220
July 27, 2021 Plan
Equity, Class of Treasury Stock [Line Items]
Stock purchased under share buyback (in shares)	532	0	2,700
Stock purchased under share buyback, average price (in dollars per share)	$ 396.39	$ 0	$ 385.66
Stock purchased under share buyback	$ 210,751	$ 0	$ 1,000,000
July 26, 2022 Plan
Equity, Class of Treasury Stock [Line Items]
Stock purchased under share buyback (in shares)	0	0
Stock purchased under share buyback, average price (in dollars per share)	$ 0	$ 0
Stock purchased under share buyback	$ 0	$ 0