Segments (Sales by Revenue Recognition Method) (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
Segment Reporting Information [Line Items]
Net 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
Transferred over Time
Segment Reporting Information [Line Items]
Net sales											2,481,647	2,295,872	2,120,619
Transferred at Point in Time
Segment Reporting Information [Line Items]
Net sales											1,378,977	1,313,088	1,195,571
Space And Defense
Segment Reporting Information [Line Items]
Net sales											1,113,028	1,018,148	947,251
Space And Defense | Transferred over Time
Segment Reporting Information [Line Items]
Net sales											997,351	909,638	883,727
Space And Defense | Transferred at Point in Time
Segment Reporting Information [Line Items]
Net sales											115,677	108,510	63,524
Military Aircraft
Segment Reporting Information [Line Items]
Net sales											888,136	811,566	720,332
Military Aircraft | Transferred over Time
Segment Reporting Information [Line Items]
Net sales											732,837	656,576	602,333
Military Aircraft | Transferred at Point in Time
Segment Reporting Information [Line Items]
Net sales											155,299	154,990	117,999
Commercial Aircraft
Segment Reporting Information [Line Items]
Net sales											903,879	788,100	665,883
Commercial Aircraft | Transferred over Time
Segment Reporting Information [Line Items]
Net sales											636,760	587,233	497,221
Commercial Aircraft | Transferred at Point in Time
Segment Reporting Information [Line Items]
Net sales											267,119	200,867	168,662
Industrial
Segment Reporting Information [Line Items]
Net sales											955,581	991,146	982,724
Industrial | Transferred over Time
Segment Reporting Information [Line Items]
Net sales											114,699	142,425	137,338
Industrial | Transferred at Point in Time
Segment Reporting Information [Line Items]
Net sales											$ 840,882	$ 848,721	$ 845,386