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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 | Jul. 31, 2024 | Jan. 31, 2024
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 19,891 | $ 28,891
12 Months or Greater, Fair Value | 36,798 | 20,604
Total, Fair Value | 56,689 | 49,495
Less than 12 Months, Unrealized Losses | (18) | (99)
12 Months or Greater, Unrealized Losses | (255) | (278)
Total, Unrealized Losses | (273) | (377)
Corporate bonds [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 15,299 | 9,050
12 Months or Greater, Fair Value | 12,095 | 8,363
Total, Fair Value | 27,394 | 17,413
Less than 12 Months, Unrealized Losses | (18) | (19)
12 Months or Greater, Unrealized Losses | (90) | (116)
Total, Unrealized Losses | (108) | (135)
Asset-backed securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 1,138 | 4,821
12 Months or Greater, Fair Value | 7,551 | 6,289
Total, Fair Value | 8,689 | 11,110
Less than 12 Months, Unrealized Losses | 0 | (15)
12 Months or Greater, Unrealized Losses | (67) | (81)
Total, Unrealized Losses | (67) | (96)
U.S. government securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 3,454 | 15,020
12 Months or Greater, Fair Value | 17,152 | 5,952
Total, Fair Value | 20,606 | 20,972
Less than 12 Months, Unrealized Losses | 0 | (65)
12 Months or Greater, Unrealized Losses | (98) | (81)
Total, Unrealized Losses | $ (98) | $ (146)

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