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Multipemployer Pension and Postretirement Plans Narrative (Details)
12 Months Ended
Dec. 30, 2017
Minimum  
Multiemployer Plans [Line Items]  
Red Zone Multiemployer Plans Funded Percentage 0.00%
Yellow Zone Multiemployer Plans Funded Percentage 65.00%
Green Zone Multiemployer Plan Funded Percentage 80.00%
Maximum  
Multiemployer Plans [Line Items]  
Red Zone Multiemployer Plans Funded Percentage 65.00%
Yellow Zone Multiemployer Plans Funded Percentage 80.00%
Green Zone Multiemployer Plan Funded Percentage 100.00%