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Income Taxes - Reconciliation of the Provision for Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 29, 2018 | Jan. 27, 2019 | Jan. 28, 2018 | Jan. 29, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax at statutory rate |  | $ 13,223 | $ 20,222 | $ 25,571
State income taxes, net of federal benefit |  | (55) | (159) | 0
Foreign taxes differential |  | 2,910 | (8,698) | (12,074)
Tax credits generated |  | (3,344) | (3,278) | (2,864)
Changes in valuation allowance | $ (15,800) | (23,029) | (41,911) | 5,578
Non-taxable gain on sale |  | 0 | 0 | (2,978)
Changes in uncertain tax positions |  | 2,219 | 1,538 | 1,047
Equity compensation |  | 1,849 | (8,333) | 2,553
Permanent differences |  | 0 | 264 | 448
Revaluation of deferred tax assets and liabilities |  | 1,164 | 299 | 266
Impact of US Tax Reform |  | 1,904 | 65,442 | 0
Other |  | 3,075 | (2,195) | 852
(Benefit) Provision for income taxes |  | (84) | $ 23,191 | $ 18,399
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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