Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities Unrealized Loss Position at Fair Value (Detail) - USD ($) $ in Thousands	Oct. 31, 2024	Jan. 31, 2024
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	$ 52,980	$ 28,891
12 Months or Greater, Fair Value	14,883	20,604
Total, Fair Value	67,863	49,495
Less than 12 Months, Unrealized Losses	(369)	(99)
12 Months or Greater, Unrealized Losses	(77)	(278)
Total, Unrealized Losses	(446)	(377)
Corporate bonds [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	23,362	9,050
12 Months or Greater, Fair Value	5,103	8,363
Total, Fair Value	28,465	17,413
Less than 12 Months, Unrealized Losses	(126)	(19)
12 Months or Greater, Unrealized Losses	(22)	(116)
Total, Unrealized Losses	(148)	(135)
Asset-backed securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	9,132	4,821
12 Months or Greater, Fair Value	4,998	6,289
Total, Fair Value	14,130	11,110
Less than 12 Months, Unrealized Losses	(62)	(15)
12 Months or Greater, Unrealized Losses	(29)	(81)
Total, Unrealized Losses	(91)	(96)
U.S. government securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	20,486	15,020
12 Months or Greater, Fair Value	4,782	5,952
Total, Fair Value	25,268	20,972
Less than 12 Months, Unrealized Losses	(181)	(65)
12 Months or Greater, Unrealized Losses	(26)	(81)
Total, Unrealized Losses	$ (207)	$ (146)