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LONG-TERM DEBT (Schedule of Long Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Debt Instrument [Line Items]      
Long-term debt $ 798,020 $ 617,306 $ 687,074
Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term debt 400,000 400,000 400,000
Less unamortized issuance-related costs for senior notes (2,980) (3,694) (3,926)
Senior notes, net 397,020 396,306 396,074
Secured revolving credit facility [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 401,000 $ 221,000 $ 291,000