Stock-based Compensation - Classification of Stock-based Compensation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Stock-based compensation:
Total stock-based compensation	$ 27,612	$ 28,122	$ 53,648	$ 55,387
Cost of revenue [Member]
Stock-based compensation:
Total stock-based compensation	833	885	1,440	1,826
Research and development [Member]
Stock-based compensation:
Total stock-based compensation	18,395	18,550	36,016	36,911
Selling, general and administrative [Member]
Stock-based compensation:
Total stock-based compensation	$ 8,384	$ 8,687	$ 16,192	$ 16,650