Segments (Disaggregation of Operating Results) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2026	Mar. 29, 2025	Mar. 28, 2026	Mar. 29, 2025
Segment Reporting
Net sales	$ 1,051,947	$ 934,022	$ 2,152,293	$ 1,841,904
Cost of sales	764,392	675,255	1,570,498	1,338,059
Inventory write-down	0	2,149	0	2,149
Research and development	26,662	24,481	51,296	48,086
Selling, general and administrative	136,324	133,932	285,283	262,069
Other operating (income) expense	(836)	1,421	(737)	4,310
Space And Defense
Segment Reporting
Net sales	313,593	270,184	637,871	517,968
Cost of sales	222,710	196,780	452,211	379,279
Inventory write-down	0	449	0	449
Research and development	9,550	5,939	17,731	11,270
Selling, general and administrative	36,893	33,674	79,987	65,084
Other operating (income) expense	1,175	564	1,907	328
Military Aircraft
Segment Reporting
Net sales	235,489	213,849	482,900	427,269
Cost of sales	173,028	155,801	360,445	315,550
Inventory write-down	0	0	0	0
Research and development	6,175	6,947	11,290	12,946
Selling, general and administrative	24,861	27,579	51,852	51,998
Other operating (income) expense	(885)	(194)	(1,125)	(550)
Commercial Aircraft
Segment Reporting
Net sales	247,007	215,563	514,850	434,053
Cost of sales	199,839	171,865	419,847	347,601
Inventory write-down	0	0	0	0
Research and development	2,172	2,649	4,541	5,182
Selling, general and administrative	15,893	16,043	33,354	30,870
Other operating (income) expense	(213)	(341)	(622)	(714)
Industrial
Segment Reporting
Net sales	255,858	234,426	516,672	462,614
Cost of sales	168,815	150,809	337,995	295,629
Inventory write-down	0	1,700	0	1,700
Research and development	8,765	8,946	17,734	18,688
Selling, general and administrative	46,145	44,369	92,660	88,693
Other operating (income) expense	(913)	1,392	(897)	5,246
Corporate Segment and Other Operating Segment
Segment Reporting
Selling, general and administrative	7,762	8,572	17,705	17,404
Other Operating Segment
Segment Reporting
Selling, general and administrative	$ 4,770	$ 3,695	$ 9,725	$ 8,020