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Pension Benefits - Reconciliation of Significant Observable Inputs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2015
Dec. 28, 2014
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Actual gain on plan assets still held and sold during the period $ (2,221) $ (806)
Capital contribution 1,288 2,008
Return of Capital (5,138) (5,043)
Level 3 [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Balance at beginning of year 67,021 70,862
Balance at end of year 60,950 67,021
Hedge Fund [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Actual gain on plan assets still held and sold during the period (51)  
Capital contribution 0  
Return of Capital 0  
Hedge Fund [Member] | Level 3 [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Balance at beginning of year 31,294  
Balance at end of year 31,243 31,294
Private Equity [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Actual gain on plan assets still held and sold during the period (2,170) (1,775)
Capital contribution 1,288 2,008
Return of Capital (5,138) (5,043)
Private Equity [Member] | Level 3 [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Balance at beginning of year 35,727 40,537
Balance at end of year 29,707 35,727
Real Estate Funds [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Actual gain on plan assets still held and sold during the period   969
Capital contribution   0
Return of Capital   0
Real Estate Funds [Member] | Level 3 [Member]    
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)    
Balance at beginning of year $ 31,294 30,325
Balance at end of year   $ 31,294