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Other Postretirement Benefits - Schedule of Components of Net Periodic Postretirement Benefit Income (Details) - Other Postretirement Benefit Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 25, 2016
Dec. 27, 2015
Dec. 28, 2014
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost $ 417 $ 588 $ 580
Interest cost 1,979 2,794 3,722
Amortization and other costs 4,105 5,197 7,299
Amortization of prior service credit (8,440) (9,495) (7,199)
Net periodic postretirement benefit (income)/expense $ (1,939) $ (916) $ 4,402