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Earnings Per Share - Summary of Buyback Activity by Program (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended 19 Months Ended
Feb. 28, 2023
Nov. 30, 2022
Aug. 31, 2022
Feb. 28, 2022
Nov. 30, 2021
Aug. 31, 2021
Feb. 28, 2023
Feb. 28, 2022
Feb. 28, 2023
Equity, Class of Treasury Stock [Line Items]                  
Stock purchased under share buyback $ 22,235 $ 28,348 $ 320,334 $ 557,115 $ 5,491 $ 659,235      
Shares acquired for taxes due (in shares) 49     50     375 261  
Shares acquired for taxes due, average price (in dollars per share) $ 448.79     $ 390.60     $ 414.23 $ 394.84  
Shares acquired for taxes due $ 22,235     $ 19,460     $ 155,483 $ 102,966  
Total repurchase of Cintas common stock $ 22,235     $ 557,115     $ 370,917 $ 1,221,841  
Share Buyback Programs                  
Equity, Class of Treasury Stock [Line Items]                  
Stock purchased under share buyback (in shares) 0     1,386     544 2,976  
Stock purchased under share buyback, average price (in dollars per share) $ 0     $ 388.03     $ 395.97 $ 375.94  
Stock purchased under share buyback $ 0     $ 537,655     $ 215,434 $ 1,118,875  
July 27, 2021 Plan                  
Equity, Class of Treasury Stock [Line Items]                  
Stock purchased under share buyback (in shares) 0     1,386     544 1,386 2,700
Stock purchased under share buyback, average price (in dollars per share) $ 0     $ 388.03     $ 395.97 $ 388.03 $ 385.62
Stock purchased under share buyback $ 0     $ 537,655     $ 215,434 $ 537,655 $ 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    
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