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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Sep. 30, 2018
Related Party Transactions [Abstract]      
Related party revenues $ 88,200 $ 99,100 $ 75,000
Related party expenses 86,400 98,500 $ 76,600
Accounts receivable, net 20,884 19,351  
Contract assets 3,261 9,681  
Contract liabilities $ 478 $ 111