Income Taxes - Liability For Uncertain Tax Positions (Details) (USD $) In Thousands, unless otherwise specified	Jul. 27, 2014	Jan. 26, 2014
Income Tax Contingency [Line Items]
Total accrued taxes	$ 7,834	$ 12,347
Non-current deferred tax asset [Member]
Income Tax Contingency [Line Items]
Other long-term liabilities	7,582	12,095
Other liabilities [Member]
Income Tax Contingency [Line Items]
Other long-term liabilities	$ 252	$ 252