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Income Taxes - Reconciliation of the Provision for Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 28, 2019 | Jan. 26, 2020 | Jan. 27, 2019 | Jan. 28, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax at statutory rate |  | $ 9,328 | $ 14,725 | $ 19,591
State income taxes, net of federal benefit |  | 68 | (55) | (159)
Foreign taxes differential |  | (966) | 2,910 | (8,698)
Tax credits generated |  | (2,026) | (3,344) | (3,278)
Changes in valuation allowance | $ (15,800) | (2,722) | (23,029) | (41,911)
Gain on intra-entity asset transfer |  | 6,802 | 0 | 0
Changes in uncertain tax positions |  | 8,636 | 2,219 | 1,538
Equity compensation |  | (6,008) | 786 | (8,040)
Permanent differences |  | 0 | 0 | 264
GILTI and Subpart F income |  | 538 | 1,164 | 299
Impact of US Tax Reform |  | 0 | 1,904 | 65,442
Other |  | (822) | 3,075 | (2,195)
Provision for income taxes |  | $ 12,828 | 355 | 22,853
Increase to general business credits |  |  | 5,000 |
Reduction to foreign tax credits |  |  | $ 6,900 |
Expense due to the estimated impact of the transition tax, net of foreign tax credits generated |  |  |  | $ 66,500

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