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Derivative Instruments (Gains Or Losses Recognized On Interest Rate Swap Derivative Instruments) (Details) - USD ($) $ in Thousands | 4 Months Ended
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Jan. 21, 2018 | Jan. 22, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain recognized in OCI | $ 10,291 | $ 23,086
Loss reclassified from accumulated OCI into net earnings | 1,674 | 2,066
Interest Rate Swaps | Derivatives Designated As Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain recognized in OCI | 10,291 | 23,086
Interest Rate Swaps | Interest Expense, Net | Derivatives Designated As Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss reclassified from accumulated OCI into net earnings | $ 1,674 | $ 2,066

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