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Share Capital - Common Shares Outstanding (Details) - shares | 12 Months Ended
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Jan. 31, 2024 | Jan. 31, 2023 | Jan. 31, 2022
Share Capital |  |  |
Balance, beginning of year (in shares) | 84,820,100 | 84,756,000 | 84,494,000
Stock options and share units exercised (in shares) | 363,000 | 64,000 | 262,000
Balance, end of year (in shares) | 85,183,455 | 84,820,100 | 84,756,000

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