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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
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Aug. 31, 2023 | Aug. 31, 2022
Equity, Class of Treasury Stock [Line Items] |  |
Stock purchased under share buyback | $ 73,276 | $ 320,334
Shares acquired for taxes due (in shares) | 145 | 270
Shares acquired for taxes due, average price (in dollars per share) | $ 503.20 | $ 405.93
Shares acquired for taxes due | $ 73,276 | $ 109,583
Total repurchase of Cintas common stock | $ 73,276 | $ 320,334
Share Buyback Programs |  |
Equity, Class of Treasury Stock [Line Items] |  |
Stock purchased under share buyback (in shares) | 0 | 532
Stock purchased under share buyback, average price (in dollars per share) | $ 0 | $ 396.39
Stock purchased under share buyback | $ 0 | $ 210,751
July 27, 2021 Plan |  |
Equity, Class of Treasury Stock [Line Items] |  |
Stock purchased under share buyback (in shares) | 0 | 532
Stock purchased under share buyback, average price (in dollars per share) | $ 0 | $ 396.39
Stock purchased under share buyback | $ 0 | $ 210,751
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

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