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Revenue from Contracts with Customers (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 28, 2024
Sep. 28, 2024
Revenue from Contract with Customer [Abstract]    
Unbilled receivables $ 735,759 $ 709,014
Contract advances and progress billings 293,550 299,732
Net contract assets $ 442,209 $ 409,282