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Other Postretirement Benefits - Changes in the Benefit Obligation and Plan Assets and Other Amounts (Details) - Other Postretirement Benefit Plans, Defined Benefit [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 25, 2016
Dec. 27, 2015
Dec. 28, 2014
Change in benefit obligation      
Benefit obligation at beginning of year $ 71,047 $ 81,054  
Service cost 417 588 $ 580
Interest cost 1,979 2,794 3,722
Plan participants’ contributions 4,409 4,230  
Actuarial (gain)/loss 28 (5,543)  
Plan amendments 0 1,145  
Benefits paid (12,838) (13,221)  
Benefit obligation at end of year 65,042 71,047 81,054
Change in plan assets      
Fair value of plan assets at beginning of year 0 0  
Employer contributions 8,429 8,991  
Plan participants’ contributions 4,409 4,230  
Benefits paid (12,838) (13,221)  
Fair value of plan assets at end of year 0 0 $ 0
Amount recognized in the Consolidated Balance Sheets      
Current liabilities (7,043) (8,168)  
Noncurrent liabilities (57,999) (62,879)  
Net amount recognized (65,042) (71,047)  
Amount recognized in accumulated other comprehensive loss      
Actuarial loss 22,522 26,599  
Prior service cost (32,870) (41,309)  
Total amount recognized in accumulated other comprehensive loss $ (10,348) $ (14,710)