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Debt Schedule Of Financing Fees (Details) - USD ($)
 12 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Sep. 25, 2016
Mar. 31, 2014
Mar. 30, 2014
Schedule Of Financing Fees [Line Items]          
Amortization of Financing Costs $ 4,769,000 $ 4,447,000 $ 5,541,000    
Debt Financing and Reorganization Costs Paid 437,000 373,000 422,000    
Payments of Financing Costs 437,000 373,000 422,000    
Unamortized Debt Issuance Expense 17,055,000        
Amortization Of Present Value Discount- Current Fiscal Year 3,827,000        
Amortization Of Present Value Discount- Next Fiscal Year 3,899,000        
Amortization Of Present Value Discount- Year 3 4,045,000        
Amortization Of Present Value Discount- Year 4 4,200,000        
Amortization Of Present Value Discount- Year 5 1,084,000        
Warrant liability fair value $ 1,807,000 $ 1,580,000 $ 11,760,000   $ 16,930,000
New 1st Lien Term Loan [Member]          
Schedule Of Financing Fees [Line Items]          
Debt Instrument, Unamortized Discount       $ 5,000,000