Segment Information (Segment Sales by Customer) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Segment Reporting Information
Net sales	$ 718,811	$ 689,049	$ 1,398,487	$ 1,316,584
Commercial Customer
Segment Reporting Information
Net sales	424,693	417,357	822,558	804,225
U.S. Government Customer
Segment Reporting Information
Net sales	249,111	224,688	487,199	422,643
Other Customer
Segment Reporting Information
Net sales	45,007	47,004	88,730	89,716
Aircraft Controls
Segment Reporting Information
Net sales	320,627	311,439	624,672	589,973
Aircraft Controls | Commercial Customer
Segment Reporting Information
Net sales	165,611	155,780	322,855	310,114
Aircraft Controls | U.S. Government Customer
Segment Reporting Information
Net sales	122,779	116,886	239,960	212,883
Aircraft Controls | Other Customer
Segment Reporting Information
Net sales	32,237	38,773	61,857	66,976
Space And Defense Controls
Segment Reporting Information
Net sales	164,825	143,527	320,893	276,920
Space And Defense Controls | Commercial Customer
Segment Reporting Information
Net sales	32,188	33,300	62,241	57,221
Space And Defense Controls | U.S. Government Customer
Segment Reporting Information
Net sales	121,821	102,721	236,286	199,185
Space And Defense Controls | Other Customer
Segment Reporting Information
Net sales	10,816	7,506	22,366	20,514
Industrial Systems
Segment Reporting Information
Net sales	233,359	234,083	452,922	449,691
Industrial Systems | Commercial Customer
Segment Reporting Information
Net sales	226,894	228,277	437,462	436,890
Industrial Systems | U.S. Government Customer
Segment Reporting Information
Net sales	4,511	5,081	10,953	10,575
Industrial Systems | Other Customer
Segment Reporting Information
Net sales	$ 1,954	$ 725	$ 4,507	$ 2,226