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Financial Instruments: Derivatives and Hedging (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 26, 2013
Sep. 27, 2012
Dec. 31, 2015
Financial Instruments: Derivatives and Hedging      
Interest reclassified from accumulated other comprehensive income into interest expense     $ (7,000)
Amount estimated to be reclassified into earnings within next 12 months     1,100
Cash flow hedges      
Financial Instruments: Derivatives and Hedging      
Term pursuant to interest rate swap agreement 7 years 5 years  
Unrealized gains or losses on derivative financial instruments in accumulated other comprehensive income     2,900
BMO Interest Rate Swap      
Financial Instruments: Derivatives and Hedging      
Notional Value     $ 220,000
Strike Rate (as a percent)     2.32%
Fair Value     $ (8,243)
Fair Value     8,200
BAML Interest Rate Swap      
Financial Instruments: Derivatives and Hedging      
Notional Value     $ 400,000
Strike Rate (as a percent)     0.75%
Fair Value     $ 1,132
Fair Value     $ 1,100