Income Taxes - Schedule of Effective Income Tax Rate Reconciliation Current Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Amount
U.S. federal statutory tax rate	$ 72,939
State and local income taxes, net of federal income tax effect	6,383
Changes in valuation allowance	(9,185)
Dual jurisdiction deferred taxes	6,702
Other	2,713
Stock-based compensation	(17,530)
Nondeductible compensation	23,293
Permanent book/tax differences	2,249
Research and development credits	(56,034)
Changes in unrecognized tax benefits	26,428
Provision for (benefit from) income taxes	$ 38,243	$ (819,944)	$ 19,699
Percent
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax effect	1.80%	4.00%	2.40%
Foreign tax rate differential		0.50%	37.90%
Changes in valuation allowance	(2.60%)
Other adjustments		(10.70%)	(1.20%)
Dual jurisdiction deferred taxes	1.90%	(2.90%)	36.00%
Other	0.80%
Stock-based compensation	(5.00%)
Nondeductible compensation	6.70%
Permanent book/tax differences	0.60%
Research and development credits	(16.10%)	(17.30%)	(46.00%)
Changes in unrecognized tax benefits	7.60%
Effective tax rate	11.00%	(330.70%)	21.00%
Ireland
Amount
Foreign tax rate differential	$ (6,616)
Changes in valuation allowance	(23,502)
Other adjustments	$ 5,331
Percent
Foreign tax rate differential	(1.90%)
Changes in valuation allowance	(6.80%)
Other adjustments	1.50%
Other foreign jurisdictions
Amount
Foreign tax rate differential	$ 8,331
Percent
Foreign tax rate differential	2.40%
U.S.
Amount
Other adjustments	$ (3,259)
Percent
Other adjustments	(0.90%)