Fair Value Measurements - Schedule of Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2023	Jan. 31, 2022
Cash and cash equivalents:
Amortized Cost	$ 137,941	$ 1,669,304
Short-term investments:
Amortized Cost	487,200
Gross Unrealized Gains	49
Gross Unrealized Losses	(1,665)
Short-term investments	485,584
Long-term investments:
Amortized Cost	528,127
Gross Unrealized Gains	205
Gross Unrealized Losses	(5,410)
Estimated Fair Value	522,922
Total assets measured at fair value, Amortized Cost	1,153,268
Total assets measured at fair value, Gross Unrealized Gains	254
Total assets measured at fair value, Gross Unrealized Losses	(7,075)
Total assets measured at fair value, Estimated Fair Value	1,146,447
Cash
Cash and cash equivalents:
Amortized Cost	35,055
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	35,055
Money market funds
Cash and cash equivalents:
Estimated Fair Value		1,641,642
Total cash and cash equivalents
Cash and cash equivalents:
Amortized Cost	137,941
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	137,941
Level 1 | U.S. Treasury securities
Short-term investments:
Amortized Cost	144,392
Gross Unrealized Gains	1
Gross Unrealized Losses	(501)
Short-term investments	143,892
Long-term investments:
Amortized Cost	192,337
Gross Unrealized Gains	0
Gross Unrealized Losses	(2,460)
Estimated Fair Value	189,877
Level 1 | Money market funds
Cash and cash equivalents:
Amortized Cost	102,886
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	102,886	1,641,642
Level 2 | Commercial paper
Short-term investments:
Amortized Cost	230,305
Gross Unrealized Gains	30
Gross Unrealized Losses	(667)
Short-term investments	229,668
Level 2 | Corporate notes and bonds
Short-term investments:
Amortized Cost	38,443
Gross Unrealized Gains	15
Gross Unrealized Losses	(148)
Short-term investments	38,310
Long-term investments:
Amortized Cost	233,946
Gross Unrealized Gains	178
Gross Unrealized Losses	(2,029)
Estimated Fair Value	232,095
Level 2 | U.S. agency securities
Short-term investments:
Amortized Cost	74,060
Gross Unrealized Gains	3
Gross Unrealized Losses	(349)
Short-term investments	73,714
Long-term investments:
Amortized Cost	101,844
Gross Unrealized Gains	27
Gross Unrealized Losses	(921)
Estimated Fair Value	$ 100,950
Level 2 | Money market funds
Cash and cash equivalents:
Estimated Fair Value		$ 0