Organization and Basis of Presentation (Fiscal Year) (Details)	12 Months Ended
	Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Fiscal Year [Line Items]
Number of weeks in reporting period	52	52	52
Minimum
Fiscal Year [Line Items]
Number of weeks in reporting period	52
Maximum
Fiscal Year [Line Items]
Number of weeks in reporting period	53