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Operating (Gains), Losses and Other Charges, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2018
Mar. 29, 2017
Dec. 27, 2017
Other Income and Expenses [Abstract]      
Software implementation costs $ 0 $ 2,124  
Gains on sales of assets and other, net (37) (1,440)  
Restructuring charges and exit costs 360 99  
Impairment charges 37 0  
Operating (gains), losses and other charges, net 360 783  
Restructuring Charges [Abstract]      
Exit costs 24 [1] 31  
Severance and other restructuring charges 336 68  
Total restructuring charges and exit costs 360 99  
Restructuring Reserve [Roll Forward]      
Balance, December 27, 2017 1,180    
Exit costs 24 [1] $ 31  
Payments, net of sublease receipts (128)    
Interest accretion 21    
Balance, March 28, 2018 1,097    
Less current portion included in other current liabilities 333    
Long-term portion included in other noncurrent liabilities 764    
Accrued severance and other restructuring charges $ 300   $ 100
[1] Included as a component of operating (gains), losses and other charges, net.