Segment Information (Segment Sales By Market Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information
Net sales	$ 657,539	$ 740,969	$ 2,177,659	$ 2,139,456
Aircraft Controls
Segment Reporting Information
Net sales	249,388	336,735	930,749	961,407
Aircraft Controls | Military
Segment Reporting Information
Net sales	177,447	162,285	526,925	464,102
Aircraft Controls | Commercial
Segment Reporting Information
Net sales	71,941	174,450	403,824	497,305
Space And Defense Controls
Segment Reporting Information
Net sales	183,906	173,045	563,156	493,938
Space And Defense Controls | Space
Segment Reporting Information
Net sales	74,324	55,737	210,628	159,262
Space And Defense Controls | Defense
Segment Reporting Information
Net sales	109,582	117,308	352,528	334,676
Industrial Systems
Segment Reporting Information
Net sales	224,245	231,189	683,754	684,111
Industrial Systems | Energy
Segment Reporting Information
Net sales	31,537	30,413	98,248	89,687
Industrial Systems | Industrial Automation
Segment Reporting Information
Net sales	94,504	113,784	307,512	339,283
Industrial Systems | Simulation and Test
Segment Reporting Information
Net sales	24,233	28,123	78,348	88,418
Industrial Systems | Medical
Segment Reporting Information
Net sales	$ 73,971	$ 58,869	$ 199,646	$ 166,723