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Debt Schedule Of Financing Fees (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 26, 2017
Mar. 27, 2016
Mar. 26, 2017
Mar. 27, 2016
Dec. 25, 2016
Sep. 25, 2016
Mar. 31, 2014
Mar. 30, 2014
Schedule Of Financing Fees [Line Items]                
Class of Warrant or Right, Outstanding 6,000,000   6,000,000          
Unamortized Debt Issuance Expense $ 24,421,000   $ 24,421,000     $ 26,271,000    
Amortization Of Present Value Discount- Current Fiscal Year 4,114,000   4,114,000          
Amortization Of Present Value Discount- Next Fiscal Year 4,206,000   4,206,000          
Amortization Of Present Value Discount- Year 3 4,051,000   4,051,000          
Amortization Of Present Value Discount- Year 4 4,103,000   4,103,000          
Amortization Of Present Value Discount- Year 5 4,300,000   $ 4,300,000          
Investment Warrants, Exercise Price     $ 4.19          
Warrant liability fair value 4,382,000   $ 4,382,000   $ 8,665,000 $ 11,760,000   $ 16,930,000
Amortization of Debt Issuance Costs $ 952,000 $ 1,844,000 1,852,000 $ 3,080,000        
Gains (Losses) on Extinguishment of Debt   $ (725,000) $ 0 $ 1,250,000        
New 1st Lien Term Loan [Member]                
Schedule Of Financing Fees [Line Items]                
Debt Instrument, Unamortized Discount             $ 5,000,000