Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Gross Carrying Value	$ 452,835		$ 452,835		$ 454,187
Accumulated Amortization	(213,320)		(213,320)		(199,415)
Net Carrying Amount	239,515us-gaap_FiniteLivedIntangibleAssetsNet		239,515us-gaap_FiniteLivedIntangibleAssetsNet		254,772us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense	7,227us-gaap_AmortizationOfIntangibleAssets	8,657us-gaap_AmortizationOfIntangibleAssets	14,802us-gaap_AmortizationOfIntangibleAssets	17,141us-gaap_AmortizationOfIntangibleAssets
Process Technology [Member]
Gross Carrying Value	99,558		99,558		99,683
Accumulated Amortization	(48,429)		(48,429)		(44,860)
Net Carrying Amount	51,129		51,129		54,823
Customer Relationships [Member]
Gross Carrying Value	323,578		323,578		323,931
Accumulated Amortization	(139,062)		(139,062)		(129,313)
Net Carrying Amount	184,516		184,516		194,618
Intellectual Property [Member]
Gross Carrying Value	19,290		19,290		19,954
Accumulated Amortization	(16,148)		(16,148)		(15,938)
Net Carrying Amount	3,142		3,142		4,016
Other Intangibles [Member]
Gross Carrying Value	10,409		10,409		10,619
Accumulated Amortization	(9,681)		(9,681)		(9,304)
Net Carrying Amount	728		728		1,315
Aerospace [Member]
Gross Carrying Value	367,930		367,930		367,930
Accumulated Amortization	(150,222)		(150,222)		(137,465)
Net Carrying Amount	217,708		217,708		230,465
Aerospace [Member] \| Process Technology [Member]
Gross Carrying Value	76,605		76,605		76,605
Accumulated Amortization	(34,566)		(34,566)		(31,719)
Net Carrying Amount	42,039		42,039		44,886
Aerospace [Member] \| Customer Relationships [Member]
Gross Carrying Value	282,225		282,225		282,225
Accumulated Amortization	(106,756)		(106,756)		(97,281)
Net Carrying Amount	175,469		175,469		184,944
Aerospace [Member] \| Intellectual Property [Member]
Gross Carrying Value	0		0		0
Accumulated Amortization	0		0		0
Net Carrying Amount	0		0		0
Aerospace [Member] \| Other Intangibles [Member]
Gross Carrying Value	9,100		9,100		9,100
Accumulated Amortization	(8,900)		(8,900)		(8,465)
Net Carrying Amount	200		200		635
Energy [Member]
Gross Carrying Value	84,905		84,905		86,257
Accumulated Amortization	(63,098)		(63,098)		(61,950)
Net Carrying Amount	21,807		21,807		24,307
Energy [Member] \| Process Technology [Member]
Gross Carrying Value	22,953		22,953		23,078
Accumulated Amortization	(13,863)		(13,863)		(13,141)
Net Carrying Amount	9,090		9,090		9,937
Energy [Member] \| Customer Relationships [Member]
Gross Carrying Value	41,353		41,353		41,706
Accumulated Amortization	(32,306)		(32,306)		(32,032)
Net Carrying Amount	9,047		9,047		9,674
Energy [Member] \| Intellectual Property [Member]
Gross Carrying Value	19,290		19,290		19,954
Accumulated Amortization	(16,148)		(16,148)		(15,938)
Net Carrying Amount	3,142		3,142		4,016
Energy [Member] \| Other Intangibles [Member]
Gross Carrying Value	1,309		1,309		1,519
Accumulated Amortization	(781)		(781)		(839)
Net Carrying Amount	$ 528		$ 528		$ 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

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