Income Taxes - Significant Components of Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2026	Jan. 31, 2025
Deferred tax assets:
Net operating loss carryforwards	$ 13,433	$ 7,362
Research and development credit carryforwards	5,083	6,586
Stock-based compensation	29,866	59,565
Accruals and reserves	42,279	43,953
Deferred revenue	343,910	328,114
Capitalized research expenditures	635,974	514,667
Operating lease liabilities	13,885	16,551
Other assets	10,135	2,957
Total deferred tax assets	1,094,565	979,755
Valuation allowance	(11,026)	(28,990)
Total deferred tax assets net of valuation allowance	1,083,539	950,765
Deferred tax liabilities:
Property and equipment and intangible assets	(34,466)	(38,343)
Deferred contract acquisition costs	(79,421)	(76,439)
Operating right-of-use assets	(12,099)	(14,233)
Strategic investments	(313,698)	(75,290)
Total deferred tax liabilities	(439,684)	(204,305)
Net deferred tax assets	$ 643,855	$ 746,460