Cash and Cash Equivalents, Investments and Fair Value Measurements - Schedule of Investments (Details) - USD ($) $ in Thousands	Oct. 31, 2023	Jan. 31, 2023
Cash and cash equivalents:
Amortized Cost	$ 127,340	$ 137,941
Short-term investments:
Amortized Cost	676,173	487,200
Gross Unrealized Gains	0	49
Gross Unrealized Losses	(5,541)	(1,665)
Estimated Fair Value	670,632	485,584
Long-term investments:
Amortized Cost	314,388	528,127
Gross Unrealized Gains	2	205
Gross Unrealized Losses	(2,258)	(5,410)
Estimated Fair Value	312,132	522,922
Total assets measured at fair value, Amortized Cost	1,117,902	1,153,268
Total assets measured at fair value, Gross Unrealized Gains	2	254
Total assets measured at fair value, Gross Unrealized Losses	(7,800)	(7,075)
Total assets measured at fair value, Estimated Fair Value	1,110,104	1,146,447
Total cash and cash equivalents
Cash and cash equivalents:
Amortized Cost	127,341	137,941
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Estimated Fair Value	127,340	137,941
Level 1 | U.S. Treasury securities
Short-term investments:
Amortized Cost	249,557	144,392
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(2,178)	(501)
Estimated Fair Value	247,379	143,892
Long-term investments:
Amortized Cost	61,514	192,337
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(293)	(2,460)
Estimated Fair Value	61,223	189,877
Level 1 | Cash
Cash and cash equivalents:
Amortized Cost	37,654	35,055
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	37,654	35,055
Level 1 | Money market funds
Cash and cash equivalents:
Amortized Cost	76,323	102,886
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	76,323	102,886
Level 1 | U.S. Treasury securities
Cash and cash equivalents:
Amortized Cost	6,418
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	6,418
Level 2 | Commercial paper
Short-term investments:
Amortized Cost	40,884	230,305
Gross Unrealized Gains	0	30
Gross Unrealized Losses	(21)	(667)
Estimated Fair Value	40,863	229,668
Level 2 | Corporate notes and bonds
Short-term investments:
Amortized Cost	237,430	38,443
Gross Unrealized Gains	0	15
Gross Unrealized Losses	(2,275)	(148)
Estimated Fair Value	235,155	38,310
Long-term investments:
Amortized Cost	123,215	233,946
Gross Unrealized Gains	0	178
Gross Unrealized Losses	(1,045)	(2,029)
Estimated Fair Value	122,170	232,095
Level 2 | U.S. agency securities
Short-term investments:
Amortized Cost	148,302	74,060
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(1,067)	(349)
Estimated Fair Value	147,235	73,714
Long-term investments:
Amortized Cost	129,659	101,844
Gross Unrealized Gains	0	27
Gross Unrealized Losses	(920)	(921)
Estimated Fair Value	128,739	$ 100,950
Level 2 | Commercial paper
Cash and cash equivalents:
Amortized Cost	6,946
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Estimated Fair Value	$ 6,945