Income Taxes - Liability For Uncertain Tax Positions (Details) - USD ($) $ in Thousands	Apr. 28, 2019	Jan. 27, 2019
Income Tax Contingency [Line Items]
Total accrued taxes	$ 16,956	$ 16,971
Deferred tax assets - non-current
Income Tax Contingency [Line Items]
Total accrued taxes	12,531	12,492
Other long-term liabilities
Income Tax Contingency [Line Items]
Total accrued taxes	$ 4,425	$ 4,479