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Bank indebtedness and Long-Term Debt (Capital lease obligations) (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 2,228  
Long-term Debt, Maturities, Repayments of Principal in Year Two 2,149  
Long-term Debt, Maturities, Repayments of Principal in Year Three 3,822  
Long-term Debt, Maturities, Repayments of Principal in Year Four 993  
Long-term Debt, Maturities, Repayments of Principal in Year Five 224,530  
Long-term Debt, Maturities, Repayments of Principal after Year Five 2,027  
Long-term Debt, Maturities, Gross Repayments of Principal 235,749  
Unamortized Debt Issuance Expense (7,716) $ (8,835)
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year $ 228,033