Segment Information (Consolidated Capital Expenditures by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Capital expenditures	$ 92,336	$ 175,692	$ 286,612
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures	17,335	22,878	23,299
Aerospace [Member]
Segment Reporting Information [Line Items]
Capital expenditures	62,812	90,749	150,021
Industrial [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 12,189	$ 62,065	$ 113,292