Segment Information (Consolidated Total Assets, Depreciation and Amortization, and Capital Expenditures by Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Assets	$ 2,397,202	$ 2,218,518	$ 1,859,964
Property, plant and equipment, net	513,279	350,048
Other unallocated assets	273,510	207,535	178,605
Depreciation and amortization	77,353	74,233	68,617
Capital expenditures	207,106	141,600	64,900
Aerospace [Member]
Assets	1,440,355	1,361,861	1,059,754
Depreciation and amortization	46,895	49,887	43,840
Capital expenditures	134,307	74,964	32,244
Energy [Member]
Assets	610,345	599,007	605,842
Depreciation and amortization	22,672	20,890	21,738
Capital expenditures	55,780	28,137	22,590
Unallocated Corporate [Member]
Assets	72,992	50,115	15,763
Depreciation and amortization	7,786	3,456	3,039
Capital expenditures	17,019	38,499	10,066
Total of Reporting Segments [Member]
Assets	2,050,700	1,960,868	1,665,596
Depreciation and amortization	69,567	70,777	65,578
Capital expenditures	$ 190,087	$ 103,101	$ 54,834