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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 | Jan. 31, 2025 | Jan. 31, 2024
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 51,632 | $ 28,891
12 Months or Greater, Fair Value | 11,296 | 20,604
Total, Fair Value | 62,928 | 49,495
Less than 12 Months, Unrealized Losses | (336) | (99)
12 Months or Greater, Unrealized Losses | (36) | (278)
Total, Unrealized Losses | (372) | (377)
Corporate bonds [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 23,200 | 9,050
12 Months or Greater, Fair Value | 2,144 | 8,363
Total, Fair Value | 25,344 | 17,413
Less than 12 Months, Unrealized Losses | (116) | (19)
12 Months or Greater, Unrealized Losses | (7) | (116)
Total, Unrealized Losses | (123) | (135)
Asset-backed securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 8,052 | 4,821
12 Months or Greater, Fair Value | 4,343 | 6,289
Total, Fair Value | 12,395 | 11,110
Less than 12 Months, Unrealized Losses | (51) | (15)
12 Months or Greater, Unrealized Losses | (16) | (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 | 20,380 | 15,020
12 Months or Greater, Fair Value | 4,809 | 5,952
Total, Fair Value | 25,189 | 20,972
Less than 12 Months, Unrealized Losses | (169) | (65)
12 Months or Greater, Unrealized Losses | (13) | (81)
Total, Unrealized Losses | $ (182) | $ (146)

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