Segment Information (Consolidated Total Assets by Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Assets	$ 2,757,109	$ 2,642,362	$ 2,512,404
Other unallocated assets	234,301	209,683	206,301
Property, plant and equipment, net	922,043	876,350
Aerospace [Member]
Segment Reporting Information [Line Items]
Assets	1,722,789	1,637,522	1,566,421
Industrial [Member]
Segment Reporting Information [Line Items]
Assets	695,264	705,169	653,848
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Assets	$ 104,755	$ 89,988	$ 85,834