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