Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Stock-based compensation:
Total stock-based compensation	$ 27,409	$ 28,101	$ 82,796	$ 82,051
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	868	360	2,694	1,071
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	17,898	18,741	54,809	53,775
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 8,643	$ 9,000	$ 25,293	$ 27,205