Long-Term Debt (Debt Schedule) (Details) - USD ($)	Mar. 31, 2018	Dec. 30, 2017	Mar. 10, 2015
Debt Instrument [Line Items]
Principal amount	$ 305,917,000
Line of Credit | Term Loan
Debt Instrument [Line Items]
Principal amount	305,917,000	$ 306,791,000	$ 350,000,000
Unamortized original issue discount and debt costs	(5,109,000)	(5,616,000)	$ (3,500,000)
Less: Current portion of long-term debt	(1,813,000)	(1,508,000)
Long-term debt	$ 298,995,000	$ 299,667,000