Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 29, 2018
Dec. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Operating Loss Carryforwards [Line Items]        
New Tax Legislation expense $ 100,000 $ 10,600,000 $ 10,700,000  
Payment period for New Tax Legislation expense     8 years  
Effective income tax rate     1.70% 5.90%
Federal statutory income tax rate     24.25% 34.00%
New Tax Legislation, remeasurement of deferred tax balance     $ 600,000  
Federal net operating loss carryforwards 0   0 $ 2,902,000
Federal        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 0   0 8,500,000
State        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards $ 42,700,000   $ 42,700,000 $ 41,600,000