Segments (Sales by Market Type) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting Information [Line Items]
Net sales	$ 706,895	$ 657,539	$ 765,277	$ 754,843	$ 765,207	$ 740,969	$ 718,811	$ 679,676	$ 2,884,554	$ 2,904,663	$ 2,709,468
Aircraft Controls
Segment Reporting Information [Line Items]
Net sales									1,205,750	1,302,972	1,193,505
Space and Defense Controls
Segment Reporting Information [Line Items]
Net sales									770,114	683,468	580,877
Industrial Systems
Segment Reporting Information [Line Items]
Net sales									908,690	918,223	935,086
Military | Aircraft Controls
Segment Reporting Information [Line Items]
Net sales									721,024	622,126	571,886
Commercial | Aircraft Controls
Segment Reporting Information [Line Items]
Net sales									484,726	680,846	621,619
Space | Space and Defense Controls
Segment Reporting Information [Line Items]
Net sales									294,254	218,970	214,741
Defense | Space and Defense Controls
Segment Reporting Information [Line Items]
Net sales									475,860	464,498	366,136
Energy | Industrial Systems
Segment Reporting Information [Line Items]
Net sales									127,693	120,771	163,888
Industrial Automation | Industrial Systems
Segment Reporting Information [Line Items]
Net sales									405,291	447,515	430,754
Simulation and Test | Industrial Systems
Segment Reporting Information [Line Items]
Net sales									102,600	122,935	127,321
Medical | Industrial Systems
Segment Reporting Information [Line Items]
Net sales									$ 273,106	$ 227,002	$ 213,123