Employee Benefits and Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Stock-based compensation:
Total stock-based compensation	$ 111,158	$ 87,801	$ 70,134
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	3,597	1,489	1,328
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	71,236	54,787	42,903
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 36,325	$ 31,525	$ 25,903