Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities Unrealized Loss Position at Fair Value (Detail) - USD ($) $ in Thousands	Jan. 31, 2026	Jan. 31, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	$ 13,044	$ 51,632
12 Months or Greater, Fair Value	0	11,296
Total, Fair Value	13,044	62,928
Less than 12 Months, Unrealized Losses	(28)	(336)
12 Months or Greater, Unrealized Losses	0	(36)
Total, Unrealized Losses	(28)	(372)
Corporate bonds [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	2,691	23,200
12 Months or Greater, Fair Value	0	2,144
Total, Fair Value	2,691	25,344
Less than 12 Months, Unrealized Losses	(2)	(116)
12 Months or Greater, Unrealized Losses	0	(7)
Total, Unrealized Losses	(2)	(123)
Asset-backed securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	3,582	8,052
12 Months or Greater, Fair Value	0	4,343
Total, Fair Value	3,582	12,395
Less than 12 Months, Unrealized Losses	(25)	(51)
12 Months or Greater, Unrealized Losses	0	(16)
Total, Unrealized Losses	(25)	(67)
U.S. government securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	6,771	20,380
12 Months or Greater, Fair Value	0	4,809
Total, Fair Value	6,771	25,189
Less than 12 Months, Unrealized Losses	(1)	(169)
12 Months or Greater, Unrealized Losses	0	(13)
Total, Unrealized Losses	$ (1)	$ (182)