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Derivative Instruments (Gains Or Losses Recognized On Interest Rate Swap Derivative Instruments) (Details) - USD ($)
$ in Thousands
4 Months Ended
Jan. 17, 2016
Jan. 18, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in OCI $ (11,437) $ (6,758)
Loss reclassified from accumulated OCI into income 1,444 627
Interest Rate Swaps [Member] | Derivatives Designated As Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in OCI (11,437) (6,758)
Interest Rate Swaps [Member] | Interest Expense, Net [Member] | Derivatives Designated As Hedging Instrument [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss reclassified from accumulated OCI into income $ 1,444 $ 627