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Financial Instruments: Derivatives and Hedging (Details) - Cash flow hedges - USD ($)
$ in Thousands
9 Months Ended
Aug. 26, 2013
Sep. 27, 2012
Sep. 30, 2015
BMO and BAML Interest Rate Swaps      
Financial Instruments: Derivatives and Hedging      
Unrealized gains or losses on derivative financial instruments in accumulated other comprehensive income     $ 7,800
Interest reclassified from accumulated other comprehensive income into interest expense     5,300
Amount estimated to be reclassified into earnings within next 12 months     1,900
BMO Interest Rate Swap      
Financial Instruments: Derivatives and Hedging      
Term pursuant to interest rate swap agreement 7 years    
Notional Value     $ 220,000
Strike Rate (as a percent)     2.32%
Fair Value     $ (11,287)
BAML Interest Rate Swap      
Financial Instruments: Derivatives and Hedging      
Term pursuant to interest rate swap agreement   5 years  
Notional Value     $ 400,000
Strike Rate (as a percent)     0.75%
Fair Value     $ (810)