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Bank indebtedness and Long-Term Debt (Bank indebtedness Table) (Details) - USD ($)
$ in Thousands
Dec. 29, 2018
Dec. 30, 2017
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 280,334 $ 234,090
Global Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding 276,776 230,502
Bulgarian credit facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 3,558 $ 3,588