Income Taxes - Reconciliation of Statutory Federal Income Tax to Effective Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Federal tax statutory tax rate	$ 65,876	$ 50,115	$ 56,047
State taxes	3,035	3,139	3,936
Tax credits	(23,468)	(21,415)	(9,409)
Domestic manufacturing deduction	0	0	(1,096)
Stock-based compensation	(34,569)	(33,332)	(37,347)
Foreign rate differential	411	610	(2,207)
Valuation allowance	7,408	6,666	4,010
Impact of foreign operations	470	3,381	4,842
Foreign derived intangible income deduction (FDII)	(4,836)	(2,086)	0
Others	(1,748)	1,733	(4,182)
Provision for income taxes	$ 12,579	$ 8,811	$ 14,594

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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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