Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Gross Carrying Value	$ 453,438		$ 454,187
Accumulated Amortization	(206,579)		(199,415)
Net Carrying Amount	246,859us-gaap_FiniteLivedIntangibleAssetsNet		254,772us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense	7,575us-gaap_AmortizationOfIntangibleAssets	8,484us-gaap_AmortizationOfIntangibleAssets
Process Technology [Member]
Gross Carrying Value	99,407		99,683
Accumulated Amortization	(46,554)		(44,860)
Net Carrying Amount	52,853		54,823
Customer Relationships [Member]
Gross Carrying Value	323,723		323,931
Accumulated Amortization	(134,205)		(129,313)
Net Carrying Amount	189,518		194,618
Intellectual Property [Member]
Gross Carrying Value	19,752		19,954
Accumulated Amortization	(16,137)		(15,938)
Net Carrying Amount	3,615		4,016
Other Intangibles [Member]
Gross Carrying Value	10,556		10,619
Accumulated Amortization	(9,683)		(9,304)
Net Carrying Amount	873		1,315
Aerospace [Member]
Gross Carrying Value	367,930		367,930
Accumulated Amortization	(144,012)		(137,465)
Net Carrying Amount	223,918		230,465
Aerospace [Member] \| Process Technology [Member]
Gross Carrying Value	76,605		76,605
Accumulated Amortization	(33,143)		(31,719)
Net Carrying Amount	43,462		44,886
Aerospace [Member] \| Customer Relationships [Member]
Gross Carrying Value	282,225		282,225
Accumulated Amortization	(102,019)		(97,281)
Net Carrying Amount	180,206		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	9,100		9,100
Accumulated Amortization	(8,850)		(8,465)
Net Carrying Amount	250		635
Energy [Member]
Gross Carrying Value	85,508		86,257
Accumulated Amortization	(62,567)		(61,950)
Net Carrying Amount	22,941		24,307
Energy [Member] \| Process Technology [Member]
Gross Carrying Value	22,802		23,078
Accumulated Amortization	(13,411)		(13,141)
Net Carrying Amount	9,391		9,937
Energy [Member] \| Customer Relationships [Member]
Gross Carrying Value	41,498		41,706
Accumulated Amortization	(32,186)		(32,032)
Net Carrying Amount	9,312		9,674
Energy [Member] \| Intellectual Property [Member]
Gross Carrying Value	19,752		19,954
Accumulated Amortization	(16,137)		(15,938)
Net Carrying Amount	3,615		4,016
Energy [Member] \| Other Intangibles [Member]
Gross Carrying Value	1,456		1,519
Accumulated Amortization	(833)		(839)
Net Carrying Amount	$ 623		$ 680

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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