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Debt (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 6 Months Ended
Aug. 22, 2014
Aug. 23, 2013
Aug. 03, 2013
Feb. 02, 2013
Aug. 03, 2013
August 2012 Facility [Member]
Aug. 03, 2013
November 2012 Facility [Member]
Line of Credit Facility [Line Items]            
Number of unsecured credit facilities     2 2    
Expiration date of renewed facility Aug. 22, 2014       Aug. 23, 2013 Nov. 18, 2013
Maximum borrowing capacity under renewed facility   $ 30     $ 30 $ 50
Interest rate under renewed facility higher of the bank's prime rate (as set by the bank), the federal funds rate plus 0.5% or LIBOR       higher of prime rate, the federal funds rate plus 0.5% or LIBOR prime plus 2%
Available borrowings under credit facilities     80 80    
Debt outstanding at period end     $ 0 $ 0