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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, 2025 | Jan. 31, 2025
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Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 54,284 | $ 51,632
12 Months or Greater, Fair Value | 2,742 | 11,296
Total, Fair Value | 57,026 | 62,928
Less than 12 Months, Unrealized Losses | (175) | (336)
12 Months or Greater, Unrealized Losses | (2) | (36)
Total, Unrealized Losses | (177) | (372)
Corporate bonds [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 20,568 | 23,200
12 Months or Greater, Fair Value | 568 | 2,144
Total, Fair Value | 21,136 | 25,344
Less than 12 Months, Unrealized Losses | (37) | (116)
12 Months or Greater, Unrealized Losses | 0 | (7)
Total, Unrealized Losses | (37) | (123)
Asset-backed securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 8,037 | 8,052
12 Months or Greater, Fair Value | 2,174 | 4,343
Total, Fair Value | 10,211 | 12,395
Less than 12 Months, Unrealized Losses | (25) | (51)
12 Months or Greater, Unrealized Losses | (2) | (16)
Total, Unrealized Losses | (27) | (67)
U.S. government securities [Member] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 25,679 | 20,380
12 Months or Greater, Fair Value | 0 | 4,809
Total, Fair Value | 25,679 | 25,189
Less than 12 Months, Unrealized Losses | (113) | (169)
12 Months or Greater, Unrealized Losses | 0 | (13)
Total, Unrealized Losses | $ (113) | $ (182)

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