Debt Schedule Of Financing Fees (Details) - USD ($)	9 Months Ended
	Jun. 24, 2018	Sep. 24, 2017	Mar. 26, 2017	Mar. 31, 2014	Mar. 30, 2014
Schedule Of Financing Fees [Line Items]
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ (18,301,000)	$ (21,824,000)
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 11,703,000
Class of Warrant or Right, Outstanding	6,000,000
Unamortized Debt Issuance Expense	$ 18,301,000
Amortization Of Present Value Discount- Current Fiscal Year	1,007,000
Amortization Of Present Value Discount- Next Fiscal Year	3,869,000
Amortization Of Present Value Discount- Year 3	3,947,000
Amortization Of Present Value Discount- Year 4	4,103,000
Amortization Of Present Value Discount- Year 5	$ 4,271,000
Investment Warrants, Exercise Price	$ 4.19
Warrant liability fair value	$ 1,456,000		$ 1,051,000		$ 16,930,000
Amortization of Debt Issuance Costs	$ 3,523,000
New 1st Lien Term Loan [Member]
Schedule Of Financing Fees [Line Items]
Debt Instrument, Unamortized Discount				$ 5,000,000