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Revenue from Contracts with Customers (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jul. 03, 2021
Oct. 03, 2020
Revenue from Contract with Customer [Abstract]    
Unbilled receivables $ 528,231 $ 493,734
Contract advances 259,425 203,338
Net contract assets $ 268,806 $ 290,396