Marketable Securities - Summary of Available-for-sale Marketable Securities Excluding Securities Classified within Cash and Cash Equivalents on Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Costs	$ 223,950	$ 282,908
Unrealized Gains	23	129
Unrealized Losses	(941)	(1)
Fair Value	223,032	283,036
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Costs	223,950	268,141
Unrealized Gains	23	29
Unrealized Losses	(941)	(1)
Fair Value	$ 223,032	268,169
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Costs		14,487
Unrealized Gains		100
Unrealized Losses		0
Fair Value		14,587
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Costs		280
Unrealized Gains		0
Unrealized Losses		0
Fair Value		$ 280