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Income Taxes - Narrative (Details) $ in Thousands, SFr in Millions |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 19, 2019 | Dec. 06, 2016 CHF (SFr) | Jan. 30, 2022 USD ($) | Jan. 31, 2021 USD ($) | Jan. 26, 2020 USD ($) | Jan. 27, 2019 USD ($)
Income Tax [Line Items] |  |  |  |  |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  |  | $ 50,000 |  |  |
Gross research credits available to offset taxable income |  |  | 13,498 | $ 9,700 |  |
Net deferred tax assets |  |  | 44,100 | 40,300 |  |
Valuation allowance |  |  | $ 17,506 | 15,751 | $ 16,189 | $ 18,912
Percentage of uncertain tax positions evaluating criteria |  |  | 50.00% |  |  |
Net tax benefits, if recognized, would impact the effective tax rate |  |  | $ 9,300 | $ 9,700 |  |
Unrecognized tax benefits, interest and penalties |  |  | 1,300 |  |  |
Foreign |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Reduction in statutory Cantonal tax rate, percentage |  | 70.00% |  |  |  |
Statutory Cantonal tax rate before tax holiday, percentage |  | 12.56% |  |  |  |
Statutory Cantonal tax rate after tax holiday, percentage |  | 3.77% |  |  |  |
Maximum after-tax profit subject to potential savings | SFr |  | SFr 500.0 |  |  |  |
Income tax holiday, initial term |  | 5 years |  |  |  |
Income tax holiday, possible additional term |  | 5 years |  |  |  |
Gross research credits available to offset taxable income |  |  | 6,700 |  |  |
Foreign | Swiss Federal Tax Administration (FTA) |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Reduction in statutory Cantonal tax rate, percentage | 70.00% |  |  |  |  |
Income Tax, Statutory Cantonial Tax Rate | 0.0846 |  |  |  |  |
Statutory Cantonal tax rate before tax holiday, percentage | 12.56% |  |  |  |  |
Statutory Cantonal tax rate after tax holiday, percentage | 2.54% |  |  |  |  |
Federal |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Gross research credits available to offset taxable income |  |  | 13,300 |  |  |
State |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 103,500 |  |  |
Gross research credits available to offset taxable income |  |  | $ 15,700 |  |  |
Maximum | Foreign |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Potential tax savings | SFr |  | SFr 44.0 |  |  |  |

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