FAIR VALUE MEASUREMENTS - Schedule of Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2026	Jan. 31, 2025
Cash and cash equivalents:
Amortized Cost	$ 169,627	$ 186,574
Short-term investments:
Amortized Cost	457,646	534,391
Gross Unrealized Gains	1,396	1,022
Gross Unrealized Losses	(1)	(82)
Short-term investments	459,041	535,331
Long-term investments:
Amortized Cost	104,227	395,444
Gross Unrealized Gains	465	1,360
Gross Unrealized Losses	0	(597)
Estimated Fair Value	104,692	396,207
Total assets measured at fair value, Amortized Cost	731,500	1,116,408
Total assets measured at fair value, Gross Unrealized Gains	1,861	2,385
Total assets measured at fair value, Gross Unrealized Losses	(1)	(681)
Total assets measured at fair value, Estimated Fair Value	733,360	1,118,112
Cash
Cash and cash equivalents:
Amortized Cost	124,873	94,728
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	124,873	94,728
Total cash and cash equivalents
Cash and cash equivalents:
Amortized Cost	169,627	186,573
Gross Unrealized Gains	0	3
Gross Unrealized Losses	0	(2)
Estimated Fair Value	169,627	186,574
Level 1 | U.S. Treasury securities
Short-term investments:
Amortized Cost	271,254	208,918
Gross Unrealized Gains	786	284
Gross Unrealized Losses	0	(74)
Short-term investments	272,040	209,128
Long-term investments:
Amortized Cost	45,754	208,104
Gross Unrealized Gains	227	787
Gross Unrealized Losses	0	(203)
Estimated Fair Value	45,981	208,688
Level 1 | Money market funds
Cash and cash equivalents:
Amortized Cost	44,754	61,962
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	44,754	61,962
Level 1 | Certificates of deposits
Short-term investments:
Amortized Cost		24,606
Gross Unrealized Gains		1
Gross Unrealized Losses		(2)
Short-term investments		24,605
Level 1 | Corporate notes and bonds
Short-term investments:
Amortized Cost	177,892	238,610
Gross Unrealized Gains	610	586
Gross Unrealized Losses	0	(6)
Short-term investments	178,502	239,190
Long-term investments:
Amortized Cost	58,473	173,882
Gross Unrealized Gains	238	573
Gross Unrealized Losses	0	(331)
Estimated Fair Value	58,711	174,124
Level 1 | U.S. agency securities
Short-term investments:
Amortized Cost	8,500	62,257
Gross Unrealized Gains	0	151
Gross Unrealized Losses	(1)	0
Short-term investments	$ 8,499	62,408
Long-term investments:
Amortized Cost		13,458
Gross Unrealized Gains		0
Gross Unrealized Losses		(63)
Estimated Fair Value		13,395
Level 1 | U.S. Treasury securities
Cash and cash equivalents:
Amortized Cost		9,969
Gross Unrealized Gains		3
Gross Unrealized Losses		0
Estimated Fair Value		9,972
Level 1 | Commercial paper
Cash and cash equivalents:
Amortized Cost		19,914
Gross Unrealized Gains		0
Gross Unrealized Losses		(2)
Estimated Fair Value		$ 19,912