Employee Benefits and Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Stock-based compensation:
Total stock-based compensation	$ 108,043	$ 111,316	$ 111,158
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	3,270	3,341	3,597
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	73,025	72,759	71,236
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 31,748	$ 35,216	$ 36,325