Income Taxes - Liability for Uncertain Tax Positions (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Jan. 26, 2020
Income Tax Contingency [Line Items]
Total accrued taxes	$ 25,501	$ 24,130
Noncurrent Deferred Tax Asset [Member]
Income Tax Contingency [Line Items]
Liability for uncertain tax positions - noncurrent	15,770	15,575
Other Liabilities [Member]
Income Tax Contingency [Line Items]
Liability for uncertain tax positions - noncurrent	$ 9,731	$ 8,555