Segments (Segment Sales by Customer) (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
Commercial customer
Segment Reporting
Net sales	533,709	467,670	1,111,808	962,244
U.S. Government customer (including OEM)
Segment Reporting
Net sales	391,140	373,431	799,184	697,082
Other Customer
Segment Reporting
Net sales	127,098	92,921	241,301	182,578
Space And Defense
Segment Reporting
Net sales	313,593	270,184	637,871	517,968
Space And Defense | Commercial customer
Segment Reporting
Net sales	46,706	32,007	109,053	91,109
Space And Defense | U.S. Government customer (including OEM)
Segment Reporting
Net sales	214,076	212,259	425,077	374,544
Space And Defense | Other Customer
Segment Reporting
Net sales	52,811	25,918	103,741	52,315
Military Aircraft
Segment Reporting
Net sales	235,489	213,849	482,900	427,269
Military Aircraft | U.S. Government customer (including OEM)
Segment Reporting
Net sales	176,177	159,066	372,400	319,841
Military Aircraft | Other Customer
Segment Reporting
Net sales	59,312	54,783	110,500	107,428
Commercial Aircraft
Segment Reporting
Net sales	247,007	215,563	514,850	434,053
Commercial Aircraft | Commercial customer
Segment Reporting
Net sales	235,106	205,882	493,345	415,208
Commercial Aircraft | Other Customer
Segment Reporting
Net sales	11,901	9,681	21,505	18,845
Industrial
Segment Reporting
Net sales	255,858	234,426	516,672	462,614
Industrial | Commercial customer
Segment Reporting
Net sales	251,897	229,781	509,410	455,927
Industrial | U.S. Government customer (including OEM)
Segment Reporting
Net sales	887	2,106	1,707	2,697
Industrial | Other Customer
Segment Reporting
Net sales	$ 3,074	$ 2,539	$ 5,555	$ 3,990