Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (After ASU Adoption) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Amount
U.S. Federal statutory income tax rate	$ 21,132
U.S. state and local income taxes, net of federal income tax effect	(18,320)
Global intangible low-taxed income	20,106
Subpart F income	847
Federal research credit	(1,400)
Non-deductible executive compensation	2,658
Stock-based compensation	11,757
Changes in unrecognized tax benefits	5,336
Total (benefit from) provision for income taxes	$ (181,702)	$ (4,406)	$ 14,068
Rate
U.S. Federal statutory income tax rate	21.00%	21.00%	21.00%
U.S. state and local income taxes, net of federal income tax effect	(18.20%)
Global intangible low-taxed income	20.00%
Subpart F income	0.80%
Federal research credit	(1.40%)	14.70%	18.90%
Change in valuation allowance		62.20%	(5.70%)
Non-deductible executive compensation	2.60%
Stock-based compensation	11.70%
Other adjustments		(1.60%)	(0.90%)
Statutory income tax rate differential		(11.60%)	(2.00%)
Changes in unrecognized tax benefits	5.30%
Effective income tax rate	(180.60%)	5.60%	(18.60%)
Romania
Amount
Change in valuation allowance	$ 10,668
Other nontaxable or non-deductible	1,262
Other adjustments	49
Statutory income tax rate differential	5,573
Transfer pricing adjustment	4,671
Excess R&D deductions	$ (4,978)
Rate
Change in valuation allowance	10.60%
Other nontaxable or non-deductible	1.30%
Other adjustments	0.00%
Statutory income tax rate differential	5.50%
Transfer pricing adjustment	4.60%
Excess R&D deductions	(4.90%)
India
Amount
Statutory income tax rate differential	$ 1,159
Rate
Statutory income tax rate differential	1.20%
Japan
Amount
Statutory income tax rate differential	$ 753
Rate
Statutory income tax rate differential	0.70%
Netherlands
Amount
Statutory income tax rate differential	$ 1,380
Rate
Statutory income tax rate differential	1.40%
U.K.
Amount
Statutory income tax rate differential	$ 2,187
Rate
Statutory income tax rate differential	2.20%
Other foreign jurisdictions
Amount
Statutory income tax rate differential	$ 776
Rate
Statutory income tax rate differential	0.80%
U.S.
Amount
Change in valuation allowance	$ (248,126)
Other nontaxable or non-deductible	768
Other adjustments	$ 40
Rate
Change in valuation allowance	(246.60%)
Other nontaxable or non-deductible	0.80%
Other adjustments	0.00%