Income Taxes - Liability For Uncertain Tax Positions (Details) - USD ($) $ in Thousands	Jul. 26, 2015	Jan. 25, 2015
Income Tax Contingency [Line Items]
Total accrued taxes	$ 7,475	$ 7,774
Non-current deferred tax asset [Member]
Income Tax Contingency [Line Items]
Other long-term liabilities	7,475	7,522
Other liabilities [Member]
Income Tax Contingency [Line Items]
Other long-term liabilities	$ 0	$ 252