Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Stock-based compensation:
Total stock-based compensation	$ 26,036	$ 27,265
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	607	941
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	17,621	18,361
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 7,808	$ 7,963