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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 6 Months Ended 16 Months Ended
Nov. 30, 2022
Aug. 31, 2022
Nov. 30, 2021
Aug. 31, 2021
Nov. 30, 2022
Nov. 30, 2021
Nov. 30, 2022
Equity, Class of Treasury Stock [Line Items]              
Stock purchased under share buyback $ 28,348 $ 320,334 $ 5,491 $ 659,235      
Shares acquired for taxes due (in shares) 56   13   326 211  
Shares acquired for taxes due, average price (in dollars per share) $ 423.64   $ 420.87   $ 408.97 $ 395.84  
Shares acquired for taxes due $ 23,665   $ 5,483   $ 133,248 $ 83,506  
Total repurchase of Cintas common stock $ 28,348   $ 5,483   $ 348,682 $ 664,726  
Share Buyback Programs              
Equity, Class of Treasury Stock [Line Items]              
Stock purchased under share buyback (in shares) 12   0   544 1,590  
Stock purchased under share buyback, average price (in dollars per share) $ 377.66   $ 0   $ 395.97 $ 365.41  
Stock purchased under share buyback $ 4,683   $ 0   $ 215,434 $ 581,220  
July 27, 2021 Plan              
Equity, Class of Treasury Stock [Line Items]              
Stock purchased under share buyback (in shares) 12   0   544 0 2,700
Stock purchased under share buyback, average price (in dollars per share) $ 377.66   $ 0   $ 395.97 $ 0 $ 385.62
Stock purchased under share buyback $ 4,683   $ 0   $ 215,434 $ 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    
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