Segment Information (Segment Sales by Customer) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information
Net sales	$ 765,277	$ 718,811	$ 1,520,120	$ 1,398,487
Commercial Customer
Segment Reporting Information
Net sales	422,935	424,693	843,866	822,558
U.S. Government Customer
Segment Reporting Information
Net sales	287,434	249,111	560,751	487,199
Other Customer
Segment Reporting Information
Net sales	54,908	45,007	115,503	88,730
Aircraft Controls
Segment Reporting Information
Net sales	341,407	320,627	681,361	624,672
Aircraft Controls | Commercial Customer
Segment Reporting Information
Net sales	165,623	165,611	331,883	322,855
Aircraft Controls | U.S. Government Customer
Segment Reporting Information
Net sales	140,677	122,779	272,886	239,960
Aircraft Controls | Other Customer
Segment Reporting Information
Net sales	35,107	32,237	76,592	61,857
Space And Defense Controls
Segment Reporting Information
Net sales	193,010	164,825	379,250	320,893
Space And Defense Controls | Commercial Customer
Segment Reporting Information
Net sales	34,184	32,188	68,336	62,241
Space And Defense Controls | U.S. Government Customer
Segment Reporting Information
Net sales	141,735	121,821	276,422	236,286
Space And Defense Controls | Other Customer
Segment Reporting Information
Net sales	17,091	10,816	34,492	22,366
Industrial Systems
Segment Reporting Information
Net sales	230,860	233,359	459,509	452,922
Industrial Systems | Commercial Customer
Segment Reporting Information
Net sales	223,128	226,894	443,647	437,462
Industrial Systems | U.S. Government Customer
Segment Reporting Information
Net sales	5,022	4,511	11,443	10,953
Industrial Systems | Other Customer
Segment Reporting Information
Net sales	$ 2,710	$ 1,954	$ 4,419	$ 4,507