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Commitments and Contingent Liabilities - Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Dec. 25, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rent expense $ 14,000 $ 19,000 $ 16,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 7,650    
2020 6,829    
2021 6,106    
2022 5,869    
2023 5,428    
Later years 18,110    
Total minimum lease payments $ 49,992