Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended
	Dec. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)
Segment Reporting Information
Number of Reportable Segments	3
Assets	$ 3,138,495	$ 3,090,592
Space And Defense Controls
Segment Reporting Information
Assets	613,000
Industrial Systems
Segment Reporting Information
Assets	$ 1,142,000