Income Taxes - Liability for Uncertain Tax Positions (Details) - USD ($) $ in Thousands	Jan. 27, 2019	Jan. 28, 2018
Income Tax Contingency [Line Items]
Total accrued taxes	$ 16,971	$ 16,059
Noncurrent Deferred Tax Asset [Member]
Income Tax Contingency [Line Items]
Liability for uncertain tax positions - noncurrent	12,492	12,135
Other Liabilities [Member]
Income Tax Contingency [Line Items]
Liability for uncertain tax positions - noncurrent	$ 4,479	$ 3,924