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Fair Value Measurements Fair Value Measurements (Details) - USD ($)	Dec. 30, 2018	Sep. 30, 2018	Mar. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 477,832,000	$ 484,859,000
Warrant liability fair value	1,726,000	1,807,000	$ 16,930,000
Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	390,293,750
Debt, Long-term and Short-term, Combined Amount	385,000,000	385,000,000
New Second Lien Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, Long-term and Short-term, Combined Amount	92,832,000	$ 93,556,000
2nd Lien Agreement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	$ 91,903,892