Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities Unrealized Loss Position at Fair Value (Detail) - USD ($) $ in Thousands	Apr. 30, 2025	Jan. 31, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	$ 32,730	$ 51,632
12 Months or Greater, Fair Value	7,252	11,296
Total, Fair Value	39,982	62,928
Less than 12 Months, Unrealized Losses	(103)	(336)
12 Months or Greater, Unrealized Losses	(15)	(36)
Total, Unrealized Losses	(118)	(372)
Corporate bonds [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	9,927	23,200
12 Months or Greater, Fair Value	1,901	2,144
Total, Fair Value	11,828	25,344
Less than 12 Months, Unrealized Losses	(31)	(116)
12 Months or Greater, Unrealized Losses	(3)	(7)
Total, Unrealized Losses	(34)	(123)
Asset-backed securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	5,415	8,052
12 Months or Greater, Fair Value	3,535	4,343
Total, Fair Value	8,950	12,395
Less than 12 Months, Unrealized Losses	(41)	(51)
12 Months or Greater, Unrealized Losses	(9)	(16)
Total, Unrealized Losses	(50)	(67)
U.S. government securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	17,388	20,380
12 Months or Greater, Fair Value	1,816	4,809
Total, Fair Value	19,204	25,189
Less than 12 Months, Unrealized Losses	(31)	(169)
12 Months or Greater, Unrealized Losses	(3)	(13)
Total, Unrealized Losses	$ (34)	$ (182)