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Commitments and Contingent Liabilities - Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2015
Dec. 28, 2014
Dec. 29, 2013
Commitments and Contingencies Disclosure [Abstract]      
Rent expense $ 16,000 $ 16,000 $ 16,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2016 11,416    
2017 9,564    
2018 5,550    
2019 3,152    
2020 2,827    
Later years 4,171    
Total minimum lease payments 36,680    
Less: noncancelable subleases (1,443)    
Total minimum lease payments, net of noncancelable subleases $ 35,237