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Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 6 Months Ended | 21 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2021 | Aug. 31, 2021 | Nov. 30, 2020 | Aug. 31, 2020 | Nov. 30, 2021 | Nov. 30, 2020 | Jul. 31, 2021 | Jul. 27, 2021 | Oct. 29, 2019
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |
Options granted and excluded from the computation of diluted earnings per share (in shares) | 100 |  | 200 |  | 100 | 200 |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock purchased under share buyback (shares) | 0 |  | 0 |  |  |  |  |  |
Stock purchased under share buyback | $ 5,491,000 | $ 659,235,000 | $ 2,371,000 | $ 69,011,000 |  |  |  |  |
Shares acquired for employee payroll taxes on restricted stock awards (in shares) | 100 |  | 100 |  | 200 | 200 |  |  |
Shares acquired for employee payroll taxes on restricted stock awards, average price (in dollars per share) | $ 420.87 |  | $ 333.60 |  | $ 395.84 | $ 301.01 |  |  |
Shares acquired for employee payroll taxes on restricted stock awards | $ 5,500,000 |  | $ 2,400,000 |  | $ 83,500,000 | $ 71,400,000 |  |  |
October 29, 2019 Plan |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  |  |  | $ 1,000,000,000
Stock purchased under share buyback (shares) |  |  |  |  | 1,590 | 0 | 2,800 |  |
Stock purchased under share buyback, average price (in dollars per share) |  |  |  |  | $ 365.41 | $ 0 | $ 358.93 |  |
Stock purchased under share buyback |  |  |  |  | $ 581,220,000 | $ 0 | $ 1,000,000,000 |  |
July 27, 2021 Plan |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  |  | $ 1,500,000,000 |
Stock purchased under share buyback (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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