Other Intangibles - Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2011
Gross Carrying Value	$ 404,015		$ 404,722
Accumulated Amortization	(143,918)		(135,825)
Net Carrying Amount	260,097		268,897
Amortization expense	8,258	8,543
Customer Relationships [Member]
Gross Carrying Value	246,959		247,162
Accumulated Amortization	(70,458)		(65,348)
Net Carrying Amount	176,501		181,814
Intellectual Property [Member]
Gross Carrying Value	20,007		20,162
Accumulated Amortization	(12,197)		(11,918)
Net Carrying Amount	7,810		8,244
Process Technology [Member]
Gross Carrying Value	94,871		95,142
Accumulated Amortization	(24,833)		(23,037)
Net Carrying Amount	70,038		72,105
Other Intangibles [Member]
Gross Carrying Value	42,178		42,256
Accumulated Amortization	(36,430)		(35,522)
Net Carrying Amount	5,748		6,734
Aerospace [Member]
Gross Carrying Value	316,482		316,497
Accumulated Amortization	(98,205)		(91,687)
Net Carrying Amount	218,277		224,810
Aerospace [Member] | Customer Relationships [Member]
Gross Carrying Value	205,162		205,171
Accumulated Amortization	(46,060)		(41,652)
Net Carrying Amount	159,102		163,519
Aerospace [Member] | Intellectual Property [Member]
Gross Carrying Value	0		0
Accumulated Amortization	0		0
Net Carrying Amount	0		0
Aerospace [Member] | Process Technology [Member]
Gross Carrying Value	71,687		71,691
Accumulated Amortization	(16,689)		(15,380)
Net Carrying Amount	54,998		56,311
Aerospace [Member] | Other Intangibles [Member]
Gross Carrying Value	39,633		39,635
Accumulated Amortization	(35,456)		(34,655)
Net Carrying Amount	4,177		4,980
Energy [Member]
Gross Carrying Value	87,533		88,225
Accumulated Amortization	(45,713)		(44,138)
Net Carrying Amount	41,820		44,087
Energy [Member] | Customer Relationships [Member]
Gross Carrying Value	41,797		41,991
Accumulated Amortization	(24,398)		(23,696)
Net Carrying Amount	17,399		18,295
Energy [Member] | Intellectual Property [Member]
Gross Carrying Value	20,007		20,162
Accumulated Amortization	(12,197)		(11,918)
Net Carrying Amount	7,810		8,244
Energy [Member] | Process Technology [Member]
Gross Carrying Value	23,184		23,451
Accumulated Amortization	(8,144)		(7,657)
Net Carrying Amount	15,040		15,794
Energy [Member] | Other Intangibles [Member]
Gross Carrying Value	2,545		2,621
Accumulated Amortization	(974)		(867)
Net Carrying Amount	$ 1,571		$ 1,754