Cash and Cash Equivalents, Investments and Fair Value Measurements - Schedule of Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Jan. 31, 2023
Cash and cash equivalents:
Amortized Cost	$ 133,065	$ 137,941
Short-term investments:
Amortized Cost	603,481	487,200
Gross Unrealized Gains	1	49
Gross Unrealized Losses	(4,951)	(1,665)
Estimated Fair Value	598,531	485,584
Long-term investments:
Amortized Cost	400,846	528,127
Gross Unrealized Gains	3	205
Gross Unrealized Losses	(4,471)	(5,410)
Estimated Fair Value	396,378	522,922
Total assets measured at fair value, Amortized Cost	1,137,396	1,153,268
Total assets measured at fair value, Gross Unrealized Gains	4	254
Total assets measured at fair value, Gross Unrealized Losses	(9,426)	(7,075)
Total assets measured at fair value, Estimated Fair Value	1,127,974	1,146,447
Cash
Cash and cash equivalents:
Amortized Cost	36,995	35,055
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	36,995	35,055
Total cash and cash equivalents
Cash and cash equivalents:
Amortized Cost	133,069	137,941
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4)	0
Estimated Fair Value	133,065	137,941
Level 1 | U.S. Treasury securities
Short-term investments:
Amortized Cost	231,728	144,392
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(2,002)	(501)
Estimated Fair Value	229,726	143,892
Long-term investments:
Amortized Cost	97,724	192,337
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,163)	(2,460)
Estimated Fair Value	96,561	189,877
Level 1 | Money market funds
Cash and cash equivalents:
Amortized Cost	75,994	102,886
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	75,994	102,886
Level 1 | U.S. Treasury securities
Cash and cash equivalents:
Amortized Cost	20,080
Gross Unrealized Gains	0
Gross Unrealized Losses	(4)
Estimated Fair Value	20,076
Level 1 | Commercial paper
Short-term investments:
Amortized Cost	74,731	230,305
Gross Unrealized Gains	0	30
Gross Unrealized Losses	(80)	(667)
Estimated Fair Value	74,651	229,668
Level 1 | Corporate notes and bonds
Short-term investments:
Amortized Cost	191,737	38,443
Gross Unrealized Gains	0	15
Gross Unrealized Losses	(2,060)	(148)
Estimated Fair Value	189,677	38,310
Long-term investments:
Amortized Cost	152,734	233,946
Gross Unrealized Gains	0	178
Gross Unrealized Losses	(1,599)	(2,029)
Estimated Fair Value	151,135	232,095
Level 1 | U.S. agency securities
Short-term investments:
Amortized Cost	105,285	74,060
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(809)	(349)
Estimated Fair Value	104,477	73,714
Long-term investments:
Amortized Cost	150,388	101,844
Gross Unrealized Gains	3	27
Gross Unrealized Losses	(1,709)	(921)
Estimated Fair Value	$ 148,682	$ 100,950