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Bank Indebtedness and Long-Term Debt (Bank Indebtedness Table) (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 278,688 $ 234,090
Global Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding 274,278 230,502
Bulgarian Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 4,410 $ 3,588