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Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares | 3 Months Ended
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Jul. 31, 2022 | Apr. 30, 2022 | Jan. 31, 2022 | Jul. 31, 2021 | Apr. 30, 2021 | Jan. 31, 2021
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |
Purchase of treasury shares (in shares) | 448,889,000 | 469,604,000 | 147,784,000 | 76,724,000 | 127,297,000 | 27,347,000
Dividends declared (in dollars per share) | $ 0.51 | $ 0.51 | $ 0.51 | $ 0.39 | $ 0.39 | $ 0.39

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