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Bank Indebtedness and Long-Term Debt (Disclosure of bank indebtedness and long-term debt) (Details) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 199,908 $ 245,536
Senior Secured Second Lien Notes, net of unamortized debt issuance costs 219,534 218,404
Finance lease liabilities 14,518 16,223
Asset-backed term loan 4,173 4,386
Other 5,649 6,178
Total Long-term and Current Term Debt 243,874 245,191
Less: current portion 3,292 2,987
Long-term Debt, Excluding Current Maturities, Total 240,582 242,204
Unamortized Debt Issuance Expense 3,964 5,094
Global Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding 199,654 241,666
Bulgarian Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding $ 254 $ 3,870