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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 29, 2019
Income Tax Disclosure [Abstract]    
Effective income tax rate reconciliation, change in deferred tax assets and liabilities, amount $ 32,500  
State net operating loss carryforwards   $ 27,400
Valuation allowance $ 3,554 $ 2,485