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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 29, 2020
Mar. 31, 2019
Mar. 29, 2020
Mar. 31, 2019
Sep. 29, 2019
Related Party Transactions [Abstract]          
Related party revenues $ 19,100 $ 21,800 $ 48,000 $ 45,700  
Related party expenses 18,800 $ 21,600 47,600 $ 45,100  
Accounts receivable, net 14,847   14,847   $ 19,351
Contract assets 8,985   8,985   9,681
Contract liabilities $ (489)   $ (489)   $ (111)