Financial Instruments and Fair Value - Schedule of Available-for-Sale Securities at Fair Value (Detail) - USD ($) $ in Thousands	Jan. 31, 2026	Jan. 31, 2025
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 181,979	$ 154,274
Unrealized Gains	601	139
Unrealized Losses	(28)	(372)
Fair Value	182,552	154,041
Money Market Funds and Fixed Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	61,000	48,398
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	61,000	48,398
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	63,777	55,138
Unrealized Gains	382	111
Unrealized Losses	(2)	(123)
Fair Value	64,157	55,126
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,388	20,412
Unrealized Gains	79	20
Unrealized Losses	(25)	(67)
Fair Value	21,442	20,365
U.S. government securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,814	30,326
Unrealized Gains	140	8
Unrealized Losses	(1)	(182)
Fair Value	$ 35,953	$ 30,152