Segment Information (Segment Sales By Customer Type) (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
Aircraft Controls
Segment Reporting Information
Net sales	320,627	311,439	624,672	589,973
Aircraft Controls | Military
Segment Reporting Information
Net sales	155,016	155,659	301,817	279,859
Aircraft Controls | Commercial
Segment Reporting Information
Net sales	165,611	155,780	322,855	310,114
Space And Defense Controls
Segment Reporting Information
Net sales	164,825	143,527	320,893	276,920
Space And Defense Controls | Space
Segment Reporting Information
Net sales	53,349	57,789	103,525	107,202
Space And Defense Controls | Defense
Segment Reporting Information
Net sales	111,476	85,738	217,368	169,718
Industrial Systems
Segment Reporting Information
Net sales	233,359	234,083	452,922	449,691
Industrial Systems | Energy
Segment Reporting Information
Net sales	29,977	40,878	59,274	78,980
Industrial Systems | Industrial Automation
Segment Reporting Information
Net sales	116,369	108,323	225,499	204,768
Industrial Systems | Simulation and Test
Segment Reporting Information
Net sales	31,245	32,041	60,295	62,878
Industrial Systems | Medical
Segment Reporting Information
Net sales	$ 55,768	$ 52,841	$ 107,854	$ 103,065