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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Sep. 29, 2019
Related Party Transactions [Abstract]      
Related party revenues $ 28,900 $ 23,900  
Related party expenses 28,700 $ 23,400  
Accounts receivable, net 20,573   $ 19,351
Contract assets 11,415   9,681
Contract liabilities $ (395)   $ (111)