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Debt - Schedule of debt (Details) - USD ($)	Sep. 29, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Unamortized debt issuance costs (4)	$ (236,000)	$ (400,000)
Total indebtedness	39,764,000	39,600,000
Less short term portion	(6,667,000)	0
Long-term debt	$ 33,097,000	$ 39,600,000
J.P. Morgan Chase Bank, N.A. | Line of credit | Term Loan under Credit Facility
Debt Instrument [Line Items]
Debt, interest rate, stated percentage	4.80%
Debt	$ 40,000,000
Gordon Brothers Finance Company | Line of credit | Term loan under Amended Term Loan
Debt Instrument [Line Items]
Debt, interest rate, stated percentage		10.70%
Debt		$ 40,000,000

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