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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, 2024 | Jan. 31, 2024
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 47,529 | $ 28,891
12 Months or Greater, Fair Value | 22,811 | 20,604
Total, Fair Value | 70,340 | 49,495
Less than 12 Months, Unrealized Losses | (281) | (99)
12 Months or Greater, Unrealized Losses | (328) | (278)
Total, Unrealized Losses | (609) | (377)
Corporate bonds [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 27,191 | 9,050
12 Months or Greater, Fair Value | 7,963 | 8,363
Total, Fair Value | 35,154 | 17,413
Less than 12 Months, Unrealized Losses | (165) | (19)
12 Months or Greater, Unrealized Losses | (132) | (116)
Total, Unrealized Losses | (297) | (135)
Asset-backed securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 4,981 | 4,821
12 Months or Greater, Fair Value | 7,205 | 6,289
Total, Fair Value | 12,186 | 11,110
Less than 12 Months, Unrealized Losses | (19) | (15)
12 Months or Greater, Unrealized Losses | (104) | (81)
Total, Unrealized Losses | (123) | (96)
U.S. government securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 15,357 | 15,020
12 Months or Greater, Fair Value | 7,643 | 5,952
Total, Fair Value | 23,000 | 20,972
Less than 12 Months, Unrealized Losses | (97) | (65)
12 Months or Greater, Unrealized Losses | (92) | (81)
Total, Unrealized Losses | $ (189) | $ (146)

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