Income Taxes - Schedule of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
$
US federal statutory tax rate	$ (11,695)	$ (27,636)	$ (34,339)
State and local income taxes, net of federal income tax effect	(6,193)	(3,715)	(12,402)
Research and development tax credits	(28,582)	(44,664)	(39,319)
Foreign tax credit	0	0	(3,014)
Nondeductible executive compensation	5,428	5,603	5,512
Stock-based compensation	(468)	1,710	(64,721)
Other nontaxable or nondeductible items	(3,947)	1,850	0
Changes in unrecognized tax benefits	36,006	29,163	76,178
Provision for (benefit from) income taxes	$ 15,460	$ (2,527)	$ 13,084
%
US federal statutory tax rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax effect	11.10%	2.80%	7.60%
Research and development tax credits	51.30%	33.90%	24.10%
Foreign tax credit	0.00%	0.00%	1.80%
Nondeductible executive compensation	(9.70%)	(4.30%)	(3.40%)
Stock-based compensation	0.80%	(1.30%)	39.60%
Other nontaxable or nondeductible items	7.10%	(1.40%)	0.00%
Changes in unrecognized tax benefits	(64.70%)	(22.20%)	(46.60%)
Effective tax rate	(27.80%)	1.90%	(8.00%)
India
$
Statutory tax rate difference	$ 366	$ 634	$ 779
Other	$ 2	$ (1,584)	$ (507)
%
Statutory tax rate difference	(0.70%)	(0.50%)	(0.50%)
Other	0.00%	1.20%	0.30%
Ireland
$
Statutory tax rate difference	$ 7,613	$ 3,175	$ 5,119
Changes in valuation allowances	9,988	6,105	8,260
Non deductible/non taxable items	$ 5,761	$ 2,523	$ 881
%
Statutory tax rate difference	(13.70%)	(2.40%)	(3.10%)
Changes in valuation allowances	(17.90%)	(4.60%)	(5.10%)
Non deductible/non taxable items	(10.30%)	(1.90%)	(0.50%)
Other
$
Statutory tax rate difference	$ (1,732)	$ (8,925)	$ 2,128
%
Statutory tax rate difference	3.10%	6.80%	(1.30%)
United States
$
Other	$ 928	$ (94)	$ 4,151
Changes in valuation allowances	$ 1,985	$ 33,328	$ 64,378
%
Other	(1.70%)	0.10%	(2.50%)
Changes in valuation allowances	(3.50%)	(25.30%)	(39.40%)