Short-Term Investments - Schedule of Fair Values and Gross Unrealized Loss Position of Available-for-Sale Securities Aggregated by Investment Category (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Certificates of deposits
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 5,985	$ 3,749
Gross unrealized losses	(15)	(2)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair value	177,056	3,318
Gross unrealized losses	(1,432)	(1)
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair value	17,190	17,626
Gross unrealized losses	(2)	(2)
Corporate notes and bonds
Schedule of Available-for-sale Securities [Line Items]
Fair value	571,099	29,558
Gross unrealized losses	(5,856)	(23)
Foreign government bonds
Schedule of Available-for-sale Securities [Line Items]
Fair value	19,594	2,679
Gross unrealized losses	(179)	$ (2)
U.S. agency obligations
Schedule of Available-for-sale Securities [Line Items]
Fair value	24,725
Gross unrealized losses	(254)
U.S. treasury securities
Schedule of Available-for-sale Securities [Line Items]
Fair value	247,509
Gross unrealized losses	$ (1,756)