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Revenue from Contracts with Customers (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Jun. 29, 2024
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]    
Unbilled receivables $ 766,445 $ 706,601
Contract advances and progress billings 353,496 377,977
Net contract assets $ 412,949 $ 328,624