Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Gross Carrying Value	$ 445,256	$ 454,187
Accumulated Amortization	(220,118)	(199,415)
Net Carrying Amount	225,138	254,772
Amortization expense	29,241	33,580	$ 36,979
Process Technology [Member]
Gross Carrying Value	99,529	99,683
Accumulated Amortization	(52,032)	(44,860)
Net Carrying Amount	47,497	54,823
Customer Relationships [Member]
Gross Carrying Value	323,634	323,931
Accumulated Amortization	(149,123)	(129,313)
Net Carrying Amount	174,511	194,618
Intellectual Property [Member]
Gross Carrying Value	19,445	19,954
Accumulated Amortization	(16,921)	(15,938)
Net Carrying Amount	2,524	4,016
Other Intangibles [Member]
Gross Carrying Value	2,648	10,619
Accumulated Amortization	(2,042)	(9,304)
Net Carrying Amount	606	1,315
Aerospace [Member]
Gross Carrying Value	360,230	367,930
Accumulated Amortization	(154,943)	(137,465)
Net Carrying Amount	205,287	230,465
Aerospace [Member] | Process Technology [Member]
Gross Carrying Value	76,605	76,605
Accumulated Amortization	(37,411)	(31,719)
Net Carrying Amount	39,194	44,886
Aerospace [Member] | Customer Relationships [Member]
Gross Carrying Value	282,225	282,225
Accumulated Amortization	(116,232)	(97,281)
Net Carrying Amount	165,993	184,944
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	1,400	9,100
Accumulated Amortization	(1,300)	(8,465)
Net Carrying Amount	100	635
Energy [Member]
Gross Carrying Value	85,026	86,257
Accumulated Amortization	(65,175)	(61,950)
Net Carrying Amount	19,851	24,307
Energy [Member] | Process Technology [Member]
Gross Carrying Value	22,924	23,078
Accumulated Amortization	(14,621)	(13,141)
Net Carrying Amount	8,303	9,937
Energy [Member] | Customer Relationships [Member]
Gross Carrying Value	41,409	41,706
Accumulated Amortization	(32,891)	(32,032)
Net Carrying Amount	8,518	9,674
Energy [Member] | Intellectual Property [Member]
Gross Carrying Value	19,445	19,954
Accumulated Amortization	(16,921)	(15,938)
Net Carrying Amount	2,524	4,016
Energy [Member] | Other Intangibles [Member]
Gross Carrying Value	1,248	1,519
Accumulated Amortization	(742)	(839)
Net Carrying Amount	$ 506	$ 680