Segment Information (Segment Sales by Customer) (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
Commercial Customer
Segment Reporting Information
Net sales	320,719	430,703	1,164,585	1,253,261
U.S. Government Customer
Segment Reporting Information
Net sales	291,430	262,083	852,181	749,282
Other Customer
Segment Reporting Information
Net sales	45,390	48,183	160,893	136,913
Aircraft Controls
Segment Reporting Information
Net sales	249,388	336,735	930,749	961,407
Aircraft Controls | Commercial Customer
Segment Reporting Information
Net sales	71,941	174,450	403,824	497,305
Aircraft Controls | U.S. Government Customer
Segment Reporting Information
Net sales	148,768	125,387	421,654	365,347
Aircraft Controls | Other Customer
Segment Reporting Information
Net sales	28,679	36,898	105,271	98,755
Space And Defense Controls
Segment Reporting Information
Net sales	183,906	173,045	563,156	493,938
Space And Defense Controls | Commercial Customer
Segment Reporting Information
Net sales	32,358	35,457	100,694	97,698
Space And Defense Controls | U.S. Government Customer
Segment Reporting Information
Net sales	135,469	129,266	411,891	365,552
Space And Defense Controls | Other Customer
Segment Reporting Information
Net sales	16,079	8,322	50,571	30,688
Industrial Systems
Segment Reporting Information
Net sales	224,245	231,189	683,754	684,111
Industrial Systems | Commercial Customer
Segment Reporting Information
Net sales	216,420	220,796	660,067	658,258
Industrial Systems | U.S. Government Customer
Segment Reporting Information
Net sales	7,193	7,430	18,636	18,383
Industrial Systems | Other Customer
Segment Reporting Information
Net sales	$ 632	$ 2,963	$ 5,051	$ 7,470