Debt Schedule of Payments (Details) - USD ($)	3 Months Ended
	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Mar. 29, 2015	Dec. 28, 2014
Schedule Of Debt Payments [Line Items]
Debt, Long-term and Short-term, Combined Amount				$ 703,996,000	$ 725,872,000
Repayments of Long-term Debt				26,351,000			$ 23,250,000
Gains (Losses) on Extinguishment of Debt				525,000			0
Senior Notes [Member]
Schedule Of Debt Payments [Line Items]
Debt, Long-term and Short-term, Combined Amount				395,000,000	400,000,000
Repayments of Long-term Debt							$ 5,000,000
New 1st Lien Term Loan [Member]
Schedule Of Debt Payments [Line Items]
Debt, Long-term and Short-term, Combined Amount				169,622,000	180,872,000
Repayments of Long-term Debt	$ 6,250,000	$ 6,250,000	$ 7,385,000	11,250,000
Mandatory Payment [Member] | New 1st Lien Term Loan [Member]
Schedule Of Debt Payments [Line Items]
Repayments of Long-term Debt	6,250,000	6,250,000	6,250,000	6,250,000
Voluntary Payment [Member] | New 1st Lien Term Loan [Member]
Schedule Of Debt Payments [Line Items]
Repayments of Long-term Debt	0	0	0	5,000,000
Excess Cash Flow Sweep [Member] | 2nd Lien Agreement [Member]
Schedule Of Debt Payments [Line Items]
Repayments of Long-term Debt			2,864,000	3,326,000
Excess Cash Flow Sweep [Member] | New 1st Lien Term Loan [Member]
Schedule Of Debt Payments [Line Items]
Repayments of Long-term Debt	0	0	1,135,000	0
Payment Due To Asset Sale [Member] | 2nd Lien Agreement [Member]
Schedule Of Debt Payments [Line Items]
Repayments of Long-term Debt				2,300,000	$ 5,000,000
Payment Due To Asset Sale [Member] | New 1st Lien Term Loan [Member]
Schedule Of Debt Payments [Line Items]
Repayments of Long-term Debt	$ 0	$ 0	$ 0	$ 0
Subsequent Event, Debt Payment [Member] | New 1st Lien Term Loan [Member]
Schedule Of Debt Payments [Line Items]
Repayments of Long-term Debt						$ 20,000,000