Cash and Cash Equivalents, Investments and Fair Value Measurements - Schedule of Investments (Details) - USD ($) $ in Thousands	Oct. 31, 2022	Jan. 31, 2022
Cash and cash equivalents:
Amortized Cost	$ 210,472	$ 1,669,304
Short-term investments:
Amortized Cost	494,460
Gross Unrealized Gains	0
Gross Unrealized Losses	(3,648)
Estimated Fair Value	490,812
Long-term investments:
Amortized Cost	454,973
Gross Unrealized Gains	0
Gross Unrealized Losses	(7,251)
Estimated Fair Value	447,722
Total assets measured at fair value, Amortized Cost	1,159,909
Total assets measured at fair value, Gross Unrealized Gains	0
Total assets measured at fair value, Gross Unrealized Losses	(10,903)
Total assets measured at fair value, Estimated Fair Value	1,149,006
Cash
Cash and cash equivalents:
Amortized Cost	37,776
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	37,776
Money market funds
Cash and cash equivalents:
Estimated Fair Value		1,641,642
Total cash and cash equivalents
Cash and cash equivalents:
Amortized Cost	210,476
Gross Unrealized Gains	0
Gross Unrealized Losses	(4)
Estimated Fair Value	210,472
Level 1 | U.S. Treasury securities
Short-term investments:
Amortized Cost	150,245
Gross Unrealized Gains	0
Gross Unrealized Losses	(1,043)
Estimated Fair Value	149,202
Long-term investments:
Amortized Cost	185,892
Gross Unrealized Gains	0
Gross Unrealized Losses	(3,012)
Estimated Fair Value	182,880
Level 1 | Money market funds
Cash and cash equivalents:
Amortized Cost	142,486
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	142,486	1,641,642
Level 2 | Commercial paper
Short-term investments:
Amortized Cost	233,773
Gross Unrealized Gains	0
Gross Unrealized Losses	(1,753)
Estimated Fair Value	232,020
Long-term investments:
Amortized Cost	18,887
Gross Unrealized Gains	0
Gross Unrealized Losses	(302)
Estimated Fair Value	18,585
Level 2 | Corporate notes and bonds
Short-term investments:
Amortized Cost	38,155
Gross Unrealized Gains	0
Gross Unrealized Losses	(252)
Estimated Fair Value	37,903
Long-term investments:
Amortized Cost	175,947
Gross Unrealized Gains	0
Gross Unrealized Losses	(2,951)
Estimated Fair Value	172,996
Level 2 | U.S. agency securities
Short-term investments:
Amortized Cost	72,287
Gross Unrealized Gains	0
Gross Unrealized Losses	(600)
Estimated Fair Value	71,687
Long-term investments:
Amortized Cost	74,247
Gross Unrealized Gains	0
Gross Unrealized Losses	(986)
Estimated Fair Value	73,261
Level 2 | Money market funds
Cash and cash equivalents:
Estimated Fair Value		$ 0
Level 2 | Corporate notes and bonds
Cash and cash equivalents:
Amortized Cost	7,729
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	7,729
Level 2 | U.S. agency securities
Cash and cash equivalents:
Amortized Cost	22,485
Gross Unrealized Gains	0
Gross Unrealized Losses	(4)
Estimated Fair Value	$ 22,481