Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 25, 2018	Dec. 26, 2017
Income Tax Examination [Line Items]
Deferred tax assets	$ 0	$ 0
Income tax provision or benefit	$ 0	$ 0
Effective income tax rate	0.00%	0.00%
Reserves for uncertain tax positions	$ 0	$ 0
Accrual for interest and penalties	$ 0	$ 0
Minimum [Member]
Income Tax Examination [Line Items]
Years subject to income tax examination	2015
Maximum [Member]
Income Tax Examination [Line Items]
Years subject to income tax examination	2018