Cash and Cash Equivalents, Investments and Fair Value Measurements - Schedule of Investments (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Jan. 31, 2022
Cash and cash equivalents:
Amortized Cost	$ 766,101	$ 1,669,304
Short-term investments:
Amortized Cost	852,646
Gross Unrealized Gains	1
Gross Unrealized Losses	(1,229)
Estimated Fair Value	851,418
Cash
Cash and cash equivalents:
Amortized Cost	26,991
Estimated Fair Value	26,991
Money Market Funds [Member]
Cash and cash equivalents:
Estimated Fair Value		1,641,642
Cash and Cash Equivalents
Cash and cash equivalents:
Amortized Cost	766,110
Gross Unrealized Losses	(9)
Estimated Fair Value	766,101
Level 1 \| Money Market Funds [Member]
Cash and cash equivalents:
Amortized Cost	592,161
Estimated Fair Value	592,161	1,641,642
Level 1 \| U.S. Treasury securities
Cash and cash equivalents:
Amortized Cost	71,989
Estimated Fair Value	71,989
Level 1 \| U.S. Treasury securities
Short-term investments:
Amortized Cost	435,879
Gross Unrealized Gains	1
Gross Unrealized Losses	(518)
Estimated Fair Value	435,362
Level 2 \| Money Market Funds [Member]
Cash and cash equivalents:
Estimated Fair Value		$ 0
Level 2 \| Commercial paper
Cash and cash equivalents:
Amortized Cost	74,969
Gross Unrealized Losses	(9)
Estimated Fair Value	74,960
Level 2 \| Certificates of Deposit [Member]
Short-term investments:
Amortized Cost	357
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	357
Level 2 \| Commercial paper
Short-term investments:
Amortized Cost	367,072
Gross Unrealized Gains	0
Gross Unrealized Losses	(498)
Estimated Fair Value	366,574
Level 2 \| Corporate notes and bonds
Short-term investments:
Amortized Cost	47,333
Gross Unrealized Gains	0
Gross Unrealized Losses	(200)
Estimated Fair Value	47,133
Level 2 \| U.S. agency securities
Short-term investments:
Amortized Cost	2,005
Gross Unrealized Gains	0
Gross Unrealized Losses	(13)
Estimated Fair Value	$ 1,992

Cash and Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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