Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands		Sep. 25, 2018	Sep. 26, 2017
Current [Member]
Deferred assets (liabilities):
Tax effect of net operating loss carry-forward
General business credits
Partnership/Joint Venture basis differences
Deferred revenue
Property and equipment basis differences
Intangibles basis differences
Other accrued liability and asset difference		128	117
Net deferred tax assets		128	117
Less valuation allowance	[1]	(128)	(117)
Net deferred tax assets
Long Term [Member]
Deferred assets (liabilities):
Tax effect of net operating loss carry-forward		3,605	4,084
General business credits		2,264	1,378
Partnership/Joint Venture basis differences		(63)	(126)
Deferred revenue		111	75
Property and equipment basis differences		(1,444)	(859)
Intangibles basis differences		(803)	(705)
Other accrued liability and asset difference		1,055	1,454
Net deferred tax assets		4,725	5,301
Less valuation allowance	[1]	(4,725)	(5,301)
Net deferred tax assets

[1] The valuation allowance decreased by $565,000 during the year ended September 25, 2018.