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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion $ 7,600 $ 7,600
Bank indebtedness and other long-term debt, net of deferred financing costs, less current portion 961,514 965,213
debt, net of unamortized issue discount 977,747 984,806
Debt Instrument, Fair Value Disclosure 892,263 944,882
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current portion [1] 7,600 7,600
Bank indebtedness and other long-term debt, net of deferred financing costs, less current portion [1] 970,147 977,206
Estimate of Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term Debt, Fair Value [1] 7,051 7,220
Long-term Debt, Fair Value [1] $ 885,212 $ 937,662
[1] (1) Excluding net deferred financing costs.