Organization and Basis of Presentation (Fiscal Year) (Details)	3 Months Ended		6 Months Ended
	Jul. 31, 2016 weeks	Jul. 26, 2015 weeks	Jul. 31, 2016 weeks week
52 Week Fiscal Year [Member]
Organization And Basis Of Presentation [Line Items]
Number of weeks in the fiscal year reporting period			52
Number of weeks in a quarter for 52 week fiscal period	13	13	13
53 Week Fiscal Year [Member]
Organization And Basis Of Presentation [Line Items]
Number of weeks in the fiscal year reporting period			53
Number of weeks in the 4th quarter for 53 week fiscal period | week			14