Income Taxes - Liability for Uncertain Tax Positions (Details) - USD ($) $ in Thousands	Jan. 26, 2020	Jan. 27, 2019
Income Tax Contingency [Line Items]
Total accrued taxes	$ 24,130	$ 16,971
Noncurrent Deferred Tax Asset [Member]
Income Tax Contingency [Line Items]
Liability for uncertain tax positions - noncurrent	15,575	12,492
Other Liabilities [Member]
Income Tax Contingency [Line Items]
Liability for uncertain tax positions - noncurrent	$ 8,555	$ 4,479