Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Stock-based compensation:
Total stock-based compensation	$ 26,847	$ 27,409	$ 80,495	$ 82,796
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	899	868	2,339	2,694
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	18,637	17,898	54,653	54,809
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 7,311	$ 8,643	$ 23,503	$ 25,293