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Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities Unrealized Loss Position at Fair Value (Detail) - USD ($) $ in Thousands | Oct. 31, 2025 | Jan. 31, 2025
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 13,201 | $ 51,632
12 Months or Greater, Fair Value | 4,105 | 11,296
Total, Fair Value | 17,306 | 62,928
Less than 12 Months, Unrealized Losses | (13) | (336)
12 Months or Greater, Unrealized Losses | (7) | (36)
Total, Unrealized Losses | (20) | (372)
Corporate bonds [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 2,812 | 23,200
12 Months or Greater, Fair Value | 0 | 2,144
Total, Fair Value | 2,812 | 25,344
Less than 12 Months, Unrealized Losses | (3) | (116)
12 Months or Greater, Unrealized Losses | 0 | (7)
Total, Unrealized Losses | (3) | (123)
Asset-backed securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 4,236 | 8,052
12 Months or Greater, Fair Value | 903 | 4,343
Total, Fair Value | 5,139 | 12,395
Less than 12 Months, Unrealized Losses | (5) | (51)
12 Months or Greater, Unrealized Losses | (1) | (16)
Total, Unrealized Losses | (6) | (67)
U.S. government securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 6,153 | 20,380
12 Months or Greater, Fair Value | 3,202 | 4,809
Total, Fair Value | 9,355 | 25,189
Less than 12 Months, Unrealized Losses | (5) | (169)
12 Months or Greater, Unrealized Losses | (6) | (13)
Total, Unrealized Losses | $ (11) | $ (182)

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