Cash and Cash Equivalents, Investments and Fair Value Measurements - Schedule of Investments (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Jan. 31, 2024
Cash and cash equivalents:
Amortized Cost	$ 198,716	$ 256,651
Short-term investments:
Amortized Cost	576,612	671,897
Gross Unrealized Gains	3	30
Gross Unrealized Losses	(2,127)	(2,622)
Estimated Fair Value	574,488	669,305
Long-term investments:
Amortized Cost	319,181	188,069
Gross Unrealized Gains	8	703
Gross Unrealized Losses	(1,129)	(115)
Estimated Fair Value	318,060	188,657
Total assets measured at fair value, Amortized Cost	1,094,509	1,116,617
Total assets measured at fair value, Gross Unrealized Gains	11	733
Total assets measured at fair value, Gross Unrealized Losses	(3,256)	(2,737)
Total assets measured at fair value, Estimated Fair Value	1,091,264	1,114,613
Total cash and cash equivalents
Cash and cash equivalents:
Amortized Cost	198,716	256,651
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	198,716	256,651
Level 1 | U.S. Treasury securities
Short-term investments:
Amortized Cost	187,909	234,776
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(586)	(1,053)
Estimated Fair Value	187,323	233,723
Long-term investments:
Amortized Cost	86,966	27,175
Gross Unrealized Gains	0	121
Gross Unrealized Losses	(246)	0
Estimated Fair Value	86,720	27,296
Level 1 | Cash
Cash and cash equivalents:
Amortized Cost	93,033	43,925
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	93,033	43,925
Level 1 | Money market funds
Cash and cash equivalents:
Amortized Cost	105,683	204,481
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	105,683	204,481
Level 2 | Corporate notes and bonds
Short-term investments:
Amortized Cost	232,901	279,248
Gross Unrealized Gains	1	12
Gross Unrealized Losses	(960)	(1,068)
Estimated Fair Value	231,942	278,192
Long-term investments:
Amortized Cost	151,624	69,970
Gross Unrealized Gains	8	279
Gross Unrealized Losses	(623)	(67)
Estimated Fair Value	151,009	70,182
Level 2 | U.S. agency securities
Short-term investments:
Amortized Cost	155,802	157,873
Gross Unrealized Gains	2	18
Gross Unrealized Losses	(581)	(501)
Estimated Fair Value	155,223	157,390
Long-term investments:
Amortized Cost	80,591	90,924
Gross Unrealized Gains	0	303
Gross Unrealized Losses	(260)	(48)
Estimated Fair Value	$ 80,331	91,179
Level 2 | Certificates of deposit
Cash and cash equivalents:
Amortized Cost		8,245
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 8,245