Segments (Segment Sales by Customer) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Segment Reporting Information
Net sales	$ 971,363	$ 904,735	$ 2,816,518	$ 2,691,888
Commercial customer
Segment Reporting Information
Net sales	529,696	474,134	1,495,191	1,430,893
U.S. Government customer (including OEM)
Segment Reporting Information
Net sales	331,834	330,790	1,028,916	985,950
Other Customer
Segment Reporting Information
Net sales	109,833	99,811	292,411	275,045
Space And Defense
Segment Reporting Information
Net sales	287,705	258,409	805,673	755,324
Space And Defense | Commercial customer
Segment Reporting Information
Net sales	92,046	49,916	183,155	129,253
Space And Defense | U.S. Government customer (including OEM)
Segment Reporting Information
Net sales	164,443	178,636	538,987	553,261
Space And Defense | Other Customer
Segment Reporting Information
Net sales	31,216	29,857	83,531	72,810
Military Aircraft
Segment Reporting Information
Net sales	224,662	207,177	651,931	595,921
Military Aircraft | U.S. Government customer (including OEM)
Segment Reporting Information
Net sales	165,083	148,928	484,924	424,539
Military Aircraft | Other Customer
Segment Reporting Information
Net sales	59,579	58,249	167,007	171,382
Commercial Aircraft
Segment Reporting Information
Net sales	219,436	189,365	656,740	591,181
Commercial Aircraft | Commercial customer
Segment Reporting Information
Net sales	208,561	179,384	627,020	564,612
Commercial Aircraft | Other Customer
Segment Reporting Information
Net sales	10,875	9,981	29,720	26,569
Industrial
Segment Reporting Information
Net sales	239,560	249,784	702,174	749,462
Industrial | Commercial customer
Segment Reporting Information
Net sales	229,089	244,834	685,016	737,028
Industrial | U.S. Government customer (including OEM)
Segment Reporting Information
Net sales	2,308	3,226	5,005	8,150
Industrial | Other Customer
Segment Reporting Information
Net sales	$ 8,163	$ 1,724	$ 12,153	$ 4,284