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Long-Term Debt Debt Balances (Details) - USD ($)	3 Months Ended		6 Months Ended
Long-Term Debt Debt Balances (Details) - USD ($)	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Dec. 29, 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period	4.30%	6.30%	4.60%	7.00%
Total obligations under capital leases	$ 1,390,000		$ 1,390,000		$ 2,524,000
Long-term Debt	497,140,000		497,140,000		471,149,000
Less: current portion	(4,996,000)		(4,996,000)		(5,866,000)
Less: deferred financing costs	(8,376,000)		(8,376,000)		(7,768,000)
Debt Instrument, Unamortized Discount	(5,554,000)		(5,554,000)		(1,950,000)
Long-term debt, net of current portion	478,214,000		478,214,000		455,565,000
Term Loan B Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	420,750,000		420,750,000		422,875,000
Term Loan B-1 Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	75,000,000		75,000,000		0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	$ 0		$ 0		$ 45,750,000