Derivative Instruments (Gains Or Losses Recognized On Interest Rate Swap Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	4 Months Ended
	Jan. 18, 2015	Jan. 19, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI	$ (6,758)	$ (54)
Loss reclassified from accumulated OCI into income	(627)	(426)
Interest Rate Swaps [Member] | Derivatives Designated As Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI	(6,758)	(54)
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	$ (627)	$ (426)