Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Sep. 26, 2015	Sep. 27, 2014
Deferred tax assets [Abstract]
Net operating loss carryforwards	$ 55,033,000	$ 51,321,000
Allowance for doubtful accounts	340,000	1,371,000
Inventory	395,000	433,000
Intangible assets	0	122,000
Deferred revenue	1,241,000	1,524,000
Derivative instruments	0	71,000
AMT credit carryforward	1,086,000	1,086,000
Other accruals	1,718,000	2,060,000
Total deferred tax assets	59,813,000	57,988,000
Deferred tax liabilities [Abstract]
Derivative instruments	142,000	0
Intangible assets	312,000	0
Property, plant and equipment	5,314,000	6,124,000
Total deferred tax liabilities	5,768,000	6,124,000
Net deferred tax assets	54,045,000	51,864,000
Valuation allowance	(54,045,000)	(51,864,000)
Net deferred tax assets	$ 0	$ 0