Segment Reporting (Disaggregation of Operating Results) (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
Cost of sales	696,913	675,255	662,804	656,874	661,199	613,792	1,338,059	1,274,991	2,034,972	1,931,865	2,794,802	2,589,525	2,414,090
Inventory write-down	5,839	2,149	0	1,600	175	0	2,149	175	7,988	1,775	8,474	7,027	4,345
Research and development	21,906	24,481	23,605	27,791	28,382	30,579	48,086	58,961	69,992	86,752	93,671	112,773	106,551
Selling, general and administrative	$ 139,748	$ 133,932	128,137	$ 128,190	$ 125,928	120,758	262,069	246,686	401,817	374,876	553,968	501,253	474,937
Corporate expenses											33,570	32,772	25,836
Equity-based compensation expense			$ 4,325			$ 4,165	$ 8,020	$ 7,212	$ 12,669	$ 11,301	16,708	14,959	10,582
Other operating (income) expense											10,381	41,648	8,647
Space And Defense
Segment Reporting Information [Line Items]
Net sales											1,113,028	1,018,148	947,251
Cost of sales											800,982	734,844	718,545
Inventory write-down											939	1,918	0
Research and development											25,511	26,084	16,736
Selling, general and administrative											152,820	122,568	112,426
Other operating (income) expense											1,639	5,849	3,437
Military Aircraft
Segment Reporting Information [Line Items]
Net sales											888,136	811,566	720,332
Cost of sales											656,054	604,285	552,268
Inventory write-down											1,625	175	1,616
Research and development											24,549	23,475	33,941
Selling, general and administrative											108,902	89,779	70,882
Other operating (income) expense											(1,751)	8,349	1,000
Commercial Aircraft
Segment Reporting Information [Line Items]
Net sales											903,879	788,100	665,883
Cost of sales											720,296	617,858	505,884
Inventory write-down											0	0	0
Research and development											7,798	11,930	9,485
Selling, general and administrative											65,605	59,170	65,700
Other operating (income) expense											(1,613)	265	(1,223)
Industrial
Segment Reporting Information [Line Items]
Net sales											955,581	991,146	982,724
Cost of sales											617,470	632,538	637,393
Inventory write-down											5,910	4,934	2,729
Research and development											35,813	51,284	46,389
Selling, general and administrative											176,363	182,005	189,511
Other operating (income) expense											12,106	27,185	5,433
Reportable segments
Segment Reporting Information [Line Items]
Selling, general and administrative											$ 503,690	$ 453,522	$ 438,519