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Earnings Per Share - Schedule of Buyback Activity by Program (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 38 Months Ended
Jan. 07, 2026
Feb. 28, 2026
Nov. 30, 2025
Aug. 31, 2025
Feb. 28, 2025
Nov. 30, 2024
Aug. 31, 2024
Feb. 28, 2026
Feb. 28, 2025
Sep. 30, 2025
Equity, Class of Treasury Stock [Line Items]                    
Shares acquired for taxes due (in shares)   145     134     753 1,052  
Shares acquired for taxes due, average price (in dollars per share)   $ 192.95     $ 197.89     $ 213.57 $ 194.31  
Shares acquired for taxes due   $ 27,845     $ 26,611     $ 160,739 $ 204,512  
Total repurchase of Cintas common stock   $ 31,560 $ 635,570 $ 266,097 $ 26,611 $ 36,716 $ 614,802 $ 933,227 $ 678,129  
Share Buyback Programs                    
Equity, Class of Treasury Stock [Line Items]                    
Shares (in shares)   20     0     3,960 2,732  
Average Price per Share (in dollars per share)   $ 183.00     $ 0     $ 195.04 $ 173.40  
Purchase Price   $ 3,715     $ 0     $ 772,488 $ 473,617  
July 26, 2022 Plan                    
Equity, Class of Treasury Stock [Line Items]                    
Shares (in shares)   0     0     1,272 2,732 5,400
Average Price per Share (in dollars per share)   $ 0     $ 0     $ 207.13 $ 173.40 $ 185.01
Purchase Price   $ 0     $ 0     $ 263,564 $ 473,617 $ 1,000,000
July 23, 2024 Plan                    
Equity, Class of Treasury Stock [Line Items]                    
Shares (in shares)   20     0     2,688 0  
Average Price per Share (in dollars per share)   $ 183.00     $ 0     $ 189.32 $ 0  
Purchase Price   $ 3,715     $ 0     $ 508,924 $ 0  
October 28, 2025 Plan                    
Equity, Class of Treasury Stock [Line Items]                    
Shares (in shares) 0 0           0    
Average Price per Share (in dollars per share)   $ 0           $ 0    
Purchase Price   $ 0           $ 0