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Debt Schedule Of Financing Fees (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 25, 2017
Jun. 26, 2016
Jun. 25, 2017
Jun. 26, 2016
Mar. 26, 2017
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 $ 23,124,000   $ 23,124,000     $ 26,271,000    
Amortization Of Present Value Discount- Current Fiscal Year 4,170,000   4,170,000          
Amortization Of Present Value Discount- Next Fiscal Year 4,163,000   4,163,000          
Amortization Of Present Value Discount- Year 3 4,009,000   4,009,000          
Amortization Of Present Value Discount- Year 4 4,063,000   4,063,000          
Amortization Of Present Value Discount- Year 5 4,248,000   $ 4,248,000          
Investment Warrants, Exercise Price     $ 4.19          
Warrant liability fair value 1,342,000   $ 1,342,000   $ 4,382,000 $ 11,760,000   $ 16,930,000
Amortization of Debt Issuance Costs $ 1,297,000 $ 1,132,000 3,148,000 $ 4,211,000        
Gains on Extinguishment of Debt     $ 0 $ 1,250,000        
New 1st Lien Term Loan [Member]                
Schedule Of Financing Fees [Line Items]                
Debt Instrument, Unamortized Discount             $ 5,000,000