Commitments and Contingencies - Schedule of Liability for Deferred Compensation (Details) (USD $) In Thousands, unless otherwise specified	Jan. 25, 2015	Jan. 26, 2014
Schedule of liability for Deferred Compensation [Line Items]
Deferred compensation liability, current	$ 527	$ 1,478
Deferred Compensation Plan For Officers And Executives
Schedule of liability for Deferred Compensation [Line Items]
Total deferred compensation liabilities under this plan	19,768	17,043
Accrued liabilities | Deferred Compensation Plan For Officers And Executives
Schedule of liability for Deferred Compensation [Line Items]
Deferred compensation liability, current	527	1,478
Other long-term liabilities | Deferred Compensation Plan For Officers And Executives
Schedule of liability for Deferred Compensation [Line Items]
Deferred compensation liability, noncurrent	$ 19,241	$ 15,565