Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Gross Carrying Value	$ 454,187	$ 494,609
Accumulated Amortization	(199,415)	(205,834)
Net Carrying Amount	254,772	288,775
Amortization expense	33,580	36,979	32,809
Process Technology [Member]
Gross Carrying Value	99,683	100,176
Accumulated Amortization	(44,860)	(37,828)
Net Carrying Amount	54,823	62,348
Customer Relationships [Member]
Gross Carrying Value	323,931	324,233
Accumulated Amortization	(129,313)	(106,999)
Net Carrying Amount	194,618	217,234
Intellectual Property [Member]
Gross Carrying Value	19,954	20,218
Accumulated Amortization	(15,938)	(14,722)
Net Carrying Amount	4,016	5,496
Other Intangibles [Member]
Gross Carrying Value	10,619	49,982
Accumulated Amortization	(9,304)	(46,285)
Net Carrying Amount	1,315	3,697
Aerospace [Member]
Gross Carrying Value	367,930	406,294
Accumulated Amortization	(137,465)	(147,989)
Net Carrying Amount	230,465	258,305
Aerospace [Member] | Process Technology [Member]
Gross Carrying Value	76,605	76,718
Accumulated Amortization	(31,719)	(26,129)
Net Carrying Amount	44,886	50,589
Aerospace [Member] | Customer Relationships [Member]
Gross Carrying Value	282,225	282,225
Accumulated Amortization	(97,281)	(77,288)
Net Carrying Amount	184,944	204,937
Aerospace [Member] | Intellectual Property [Member]
Gross Carrying Value	0	0
Accumulated Amortization	0	0
Net Carrying Amount	0	0
Aerospace [Member] | Other Intangibles [Member]
Gross Carrying Value	9,100	47,351
Accumulated Amortization	(8,465)	(44,572)
Net Carrying Amount	635	2,779
Energy [Member]
Gross Carrying Value	86,257	88,315
Accumulated Amortization	(61,950)	(57,845)
Net Carrying Amount	24,307	30,470
Energy [Member] | Process Technology [Member]
Gross Carrying Value	23,078	23,458
Accumulated Amortization	(13,141)	(11,699)
Net Carrying Amount	9,937	11,759
Energy [Member] | Customer Relationships [Member]
Gross Carrying Value	41,706	42,008
Accumulated Amortization	(32,032)	(29,711)
Net Carrying Amount	9,674	12,297
Energy [Member] | Intellectual Property [Member]
Gross Carrying Value	19,954	20,218
Accumulated Amortization	(15,938)	(14,722)
Net Carrying Amount	4,016	5,496
Energy [Member] | Other Intangibles [Member]
Gross Carrying Value	1,519	2,631
Accumulated Amortization	(839)	(1,713)
Net Carrying Amount	$ 680	$ 918