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Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jun. 29, 2018
Dec. 29, 2017
Oct. 27, 2015
Debt Instrument [Line Items]      
Unamortized discount on term loan B and debt issuance costs $ (28,690) $ (33,278)  
Total debt 1,538,690 1,609,165  
Current portion of long-term debt (35,156) (30,469)  
Total long-term debt $ 1,503,534 1,578,696  
Senior Notes [Member] | 9.125% Senior Notes due 2023 [Member]      
Debt Instrument [Line Items]      
Stated interest rate 9.125%   9.125%
Secured Debt [Member] | Loans Payable [Member] | Term Loan A (TLA) Facility [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 321,094 335,157  
Secured Debt [Member] | Loans Payable [Member] | Term Loan B (TLB) Facility [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 812,286 873,286  
Secured Debt [Member] | Loans Payable [Member] | 9.125% Senior Notes due 2023 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 360,000 360,000  
Secured Debt [Member] | Revolving Credit Facility [Member] | New Revolving Credit Facility 2015 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 74,000 $ 74,000