Income Taxes - Reconciliation of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ 276,270	$ 174,785	$ 52,277
State taxes	56,336	37,137	13,666
Foreign rate differential	141	2,943	1,017
Non-deductible compensation	15,757	10,639	10,231
Stock-based compensation	58,770	96,936	124,631
Permanent items	10,371	4,016	9,090
Foreign-derived intangible income deduction	(56,630)	(63,571)	(76,686)
Research and development credits	(49,813)	(39,226)	(38,127)
Tax uncertainties	7,478	2,674	2,296
Change in valuation allowance	(7,765)	(14,109)	39,288
Deferred rate change	(3,993)	(6,803)	2,014
Other	(1,576)	(10,571)	5,868
Total provision for income taxes	$ 305,346	$ 194,850	$ 145,565
Effective tax rate	23.20%	23.40%	58.40%