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Debt Schedule Of Financing Fees (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 25, 2016
Sep. 24, 2017
Sep. 25, 2016
Sep. 27, 2015
Mar. 31, 2014
Mar. 30, 2014
Schedule Of Financing Fees [Line Items]            
Amortization of Financing Costs $ 5,541,000 $ 4,447,000   $ 4,693,000    
Debt Financing and Reorganization Costs Paid   373,000 $ 422,000 733,000    
Payments of Financing Costs   373,000 422,000 733,000    
Unamortized Debt Issuance Expense   21,824,000        
Amortization Of Present Value Discount- Current Fiscal Year   4,109,000        
Amortization Of Present Value Discount- Next Fiscal Year   3,962,000        
Amortization Of Present Value Discount- Year 3   4,025,000        
Amortization Of Present Value Discount- Year 4   4,200,000        
Amortization Of Present Value Discount- Year 5   4,390,000        
Warrant liability fair value $ 11,760,000 1,580,000 11,760,000 4,240,000   $ 16,930,000
Gain (Loss) on Extinguishment of Debt   $ 0 $ (1,250,000) $ 0    
New 1st Lien Term Loan [Member]            
Schedule Of Financing Fees [Line Items]            
Debt Instrument, Unamortized Discount         $ 5,000,000