Earnings Per Share - Schedule of Buyback Activity by Program (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2024	Aug. 31, 2023
Equity, Class of Treasury Stock [Line Items]
Purchase Price	$ 614,802	$ 73,276
Shares acquired for taxes due (in shares)	744	582
Shares acquired for taxes due, average price (in dollars per share)	$ 189.67	$ 125.80
Shares acquired for taxes due	$ 141,185	$ 73,276
Total repurchase of Cintas common stock	$ 614,802	$ 73,276
Share Buyback Programs
Equity, Class of Treasury Stock [Line Items]
Shares (in shares)	2,732	0
Average Price per Share (in dollars per share)	$ 173.40	$ 0
Purchase Price	$ 473,617	$ 0
July 27, 2021 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
July 26, 2022 Plan
Equity, Class of Treasury Stock [Line Items]
Shares (in shares)	2,732	0
Average Price per Share (in dollars per share)	$ 173.40	$ 0
Purchase Price	$ 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