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Goodwill and Intangible Assets (Estimated Aggregate Future Amortization Expense) (Details) - USD ($)
$ in Thousands
Jun. 26, 2018
Sep. 26, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 6  
2019 23  
2020 12  
Net Carrying Amount $ 41 $ 61