Segments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended						6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 28, 2025	Mar. 29, 2025	Dec. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023	Mar. 29, 2025	Mar. 30, 2024	Jun. 28, 2025	Jun. 29, 2024	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Revenue, Major Customer and Product Lines
Sales	$ 969,582	$ 934,022	$ 907,882	$ 914,135	$ 920,208	$ 855,222	$ 1,841,904	$ 1,775,430	$ 2,811,486	$ 2,689,565	$ 3,860,624	$ 3,608,960	$ 3,316,190
Military Aircraft
Revenue, Major Customer and Product Lines
Sales											$ 888,136	$ 811,566	$ 720,332
Military Aircraft | Aftermarket | Net Sales, Segment
Revenue, Major Customer and Product Lines
Percentage of sales											23.00%	23.00%	26.00%
Commercial Aircraft
Revenue, Major Customer and Product Lines
Sales											$ 903,879	$ 788,100	$ 665,883
Commercial Aircraft | Aftermarket | Net Sales, Segment
Revenue, Major Customer and Product Lines
Percentage of sales											37.00%	33.00%	34.00%
Boeing
Revenue, Major Customer and Product Lines
Sales											$ 396,784	$ 417,275	$ 349,961
Boeing | Customer Concentration Risk | Net Sales
Revenue, Major Customer and Product Lines
Percentage of sales											10.00%	12.00%	11.00%