Income Taxes - Reconciliation of Statutory Federal Income Tax to Effective Tax (Details) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Federal tax statutory tax rate	$ 107,585	$ 82,739	$ 65,876
State taxes	11,035	4,401	3,035
Tax credits	(25,968)	(24,617)	(23,468)
Stock-based compensation	(29,715)	(54,488)	(34,569)
Valuation allowance	19,402	10,269	7,408
Foreign derived intangible income deduction (FDII)	(3,406)	(5,134)	(4,836)
Other	5,988	825	(867)
Provision for income taxes	$ 84,921	$ 13,995	$ 12,579

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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