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Revenue - Contract Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Revenue from Contract with Customer [Abstract]    
Contract liabilities $ 10,653 $ 7,757
$ Change $ (2,896)  
% Change (37.00%)  
Amounts included in contract liabilities at the beginning of the period $ 7,646