Segment Information (Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Segment Reporting Information [Line Items]
Assets	$ 2,725,174	$ 2,757,109
Other unallocated assets	242,542	234,301
Property, plant and equipment, net	930,158	922,043
Aerospace [Member]
Segment Reporting Information [Line Items]
Assets	1,673,675	1,722,789
Industrial [Member]
Segment Reporting Information [Line Items]
Assets	695,167	695,264
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 113,790	$ 104,755