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Long-Term Debt Debt Balances (Details) - USD ($)	3 Months Ended		9 Months Ended
Long-Term Debt Debt Balances (Details) - USD ($)	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019	Dec. 29, 2019
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period	4.40%	5.70%	4.50%	6.40%
Total obligations under capital leases	$ 1,060,000		$ 1,060,000		$ 2,524,000
Long-term Debt	495,748,000		495,748,000		471,149,000
Less: current portion	(4,795,000)		(4,795,000)		(5,866,000)
Less: deferred financing costs	(8,142,000)		(8,142,000)		(7,768,000)
Debt Instrument, Unamortized Discount	(5,361,000)		(5,361,000)		(1,950,000)
Long-term debt, net of current portion	477,450,000		477,450,000		455,565,000
Term Loan B Facility [Member]
Debt Instrument [Line Items]
Long-term Line of Credit	419,688,000		419,688,000		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