Revenue from Contracts with Customers (Contract Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 27, 2025	Jun. 28, 2025	Mar. 29, 2025	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Unbilled receivables	$ 744,352	$ 719,002	$ 719,569	$ 722,384	$ 690,572	$ 745,680	$ 773,379	$ 743,497	$ 634,787
Contract advances and progress billings	372,988	$ 301,270	$ 307,640	$ 293,160	302,126	$ 353,736	$ 405,230	$ 446,547	$ 337,707
Net contract assets	$ 371,364				$ 388,446