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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 | Apr. 30, 2025 | Jan. 31, 2025
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 32,730 | $ 51,632
12 Months or Greater, Fair Value | 7,252 | 11,296
Total, Fair Value | 39,982 | 62,928
Less than 12 Months, Unrealized Losses | (103) | (336)
12 Months or Greater, Unrealized Losses | (15) | (36)
Total, Unrealized Losses | (118) | (372)
Corporate bonds [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 9,927 | 23,200
12 Months or Greater, Fair Value | 1,901 | 2,144
Total, Fair Value | 11,828 | 25,344
Less than 12 Months, Unrealized Losses | (31) | (116)
12 Months or Greater, Unrealized Losses | (3) | (7)
Total, Unrealized Losses | (34) | (123)
Asset-backed securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 5,415 | 8,052
12 Months or Greater, Fair Value | 3,535 | 4,343
Total, Fair Value | 8,950 | 12,395
Less than 12 Months, Unrealized Losses | (41) | (51)
12 Months or Greater, Unrealized Losses | (9) | (16)
Total, Unrealized Losses | (50) | (67)
U.S. government securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 17,388 | 20,380
12 Months or Greater, Fair Value | 1,816 | 4,809
Total, Fair Value | 19,204 | 25,189
Less than 12 Months, Unrealized Losses | (31) | (169)
12 Months or Greater, Unrealized Losses | (3) | (13)
Total, Unrealized Losses | $ (34) | $ (182)

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