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Debt (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 6 Months Ended
Aug. 23, 2013
Aug. 24, 2012
Jul. 28, 2012
Jul. 28, 2012
August 2011 Facility [Member]
Jul. 28, 2012
November 2011 Facility [Member]
Line of Credit Facility [Line Items]          
Number of unsecured credit facilities     2    
Expiration date of renewed facility
August 23, 2013
    August 2012 November 2012
Maximum borrowing capacity under renewed facility   $ 30.0   $ 30.0 $ 50.0
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     80.0    
Debt outstanding at period end     0    
Subsequent Event [Line Items]          
Maximum borrowing capacity under renewed facility   $ 30.0   $ 30.0 $ 50.0
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%
Expiration date of renewed facility
August 23, 2013
    August 2012 November 2012