Earnings Per Share - Schedule of Buyback Activity by Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Feb. 28, 2025	Nov. 30, 2024	Aug. 31, 2024	Feb. 29, 2024	Nov. 30, 2023	Aug. 31, 2023	Feb. 28, 2025	Feb. 29, 2024
Equity, Class of Treasury Stock [Line Items]
Purchase Price	$ 26,611	$ 36,716	$ 614,802	$ 45,018	$ 349,852	$ 73,276
Shares acquired for taxes due (in shares)	134			298			1,052	1,108
Shares acquired for taxes due, average price (in dollars per share)	$ 197.89			$ 151.13			$ 194.31	$ 133.41
Shares acquired for taxes due	$ 26,611			$ 45,018			$ 204,512	$ 147,880
Total repurchase of Cintas common stock	$ 26,611			$ 45,018			$ 678,129	$ 468,146
Share Buyback Programs
Equity, Class of Treasury Stock [Line Items]
Shares (in shares)	0			0			2,732	2,633
Average Price per Share (in dollars per share)	$ 0			$ 0			$ 173.40	$ 121.64
Purchase Price	$ 0			$ 0			$ 473,617	$ 320,266
July 27, 2021 Plan
Equity, Class of Treasury Stock [Line Items]
Shares (in shares)				0				2,633
Average Price per Share (in dollars per share)				$ 0				$ 121.64
Purchase Price				$ 0				$ 320,266
July 26, 2022 Plan
Equity, Class of Treasury Stock [Line Items]
Shares (in shares)	0			0			2,732	0
Average Price per Share (in dollars per share)	$ 0			$ 0			$ 173.40	$ 0
Purchase Price	$ 0			$ 0			$ 473,617	$ 0
July 23, 2024 Plan
Equity, Class of Treasury Stock [Line Items]
Shares (in shares)	0						0
Average Price per Share (in dollars per share)	$ 0						$ 0
Purchase Price	$ 0						$ 0