Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

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Income Taxes - Additional Information (Details) - USD ($)
Sep. 28, 2019
Sep. 29, 2018
Income Tax Disclosure [Abstract]    
State income tax credits $ 3,600,000  
Valuation allowances 7,179,000 $ 6,809,000
Accrued interest (less than) 100,000 100,000
Penalties were accrued related to uncertain tax positions 0 $ 0
Unrecognized tax benefit may be recognized within twelve months as a result of a settlement 500,000  
Decrease in unrecognized tax benefits 200,000  
State    
Operating Loss Carryforwards [Line Items]    
Net operating losses 109,600,000  
Foreign    
Operating Loss Carryforwards [Line Items]    
Net operating losses $ 4,500,000