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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 21 Months Ended
Feb. 28, 2022
Nov. 30, 2021
Aug. 31, 2021
Feb. 28, 2021
Nov. 30, 2020
Aug. 31, 2020
Feb. 28, 2022
Feb. 28, 2021
Jul. 26, 2021
Equity, Class of Treasury Stock [Line Items]                  
Stock purchased under share buyback $ 569,115 $ 5,491 $ 659,235 $ 83,108 $ 2,371 $ 69,011      
Shares acquired for taxes due (in shares) 50     4     261 241  
Shares acquired for taxes due, average price (in dollars per share) $ 390.60     $ 332.73     $ 394.84 $ 301.49  
Shares acquired for taxes due $ 19,460     $ 1,151     $ 102,966 $ 72,533  
Total repurchase of Cintas common stock $ 557,115     $ 83,108     $ 1,221,841 $ 154,490  
Share Buyback Programs                  
Equity, Class of Treasury Stock [Line Items]                  
Stock purchased under share buyback (shares) 1,386     256     2,976 256  
Stock purchased under share buyback, average price (in dollars per share) $ 388.03     $ 320.30     $ 375.94 $ 320.30  
Stock purchased under share buyback $ 537,655     $ 81,957     $ 1,118,875 $ 81,957  
October 30, 2018 Plan                  
Equity, Class of Treasury Stock [Line Items]                  
Stock purchased under share buyback (shares)       190       190  
Stock purchased under share buyback, average price (in dollars per share)       $ 319.88       $ 319.88  
Stock purchased under share buyback       $ 60,877       $ 60,877  
October 29, 2019 Plan                  
Equity, Class of Treasury Stock [Line Items]                  
Stock purchased under share buyback (shares) 0     66     1,590 66 2,800
Stock purchased under share buyback, average price (in dollars per share) $ 0     $ 321.51     $ 365.41 $ 321.51 $ 358.93
Stock purchased under share buyback $ 0     $ 21,080     $ 581,220 $ 21,080 $ 1,000,000
July 27, 2021 Plan                  
Equity, Class of Treasury Stock [Line Items]                  
Stock purchased under share buyback (shares) 1,386           1,386    
Stock purchased under share buyback, average price (in dollars per share) $ 388.03           $ 388.03    
Stock purchased under share buyback $ 537,655           $ 537,655