Other Intangibles, 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, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Gross Carrying Value	$ 483,060		$ 483,060		$ 404,061
Accumulated Amortization	(185,845)		(185,845)		(168,498)
Net Carrying Amount	297,215		297,215		235,563
Amortization expense	9,813	8,294	17,480	16,552
Process Technology [Member]
Gross Carrying Value	99,383		99,383		94,882
Accumulated Amortization	(34,071)		(34,071)		(30,328)
Net Carrying Amount	65,312		65,312		64,554
Customer Relationships [Member]
Gross Carrying Value	313,872		313,872		246,991
Accumulated Amortization	(96,223)		(96,223)		(85,920)
Net Carrying Amount	217,649		217,649		161,071
Intellectual Property [Member]
Gross Carrying Value	19,949		19,949		20,001
Accumulated Amortization	(13,874)		(13,874)		(13,229)
Net Carrying Amount	6,075		6,075		6,772
Other Intangibles [Member]
Gross Carrying Value	49,856		49,856		42,187
Accumulated Amortization	(41,677)		(41,677)		(39,021)
Net Carrying Amount	8,179		8,179		3,166
Aerospace [Member]
Gross Carrying Value	395,719		395,719		316,586
Accumulated Amortization	(131,648)		(131,648)		(117,637)
Net Carrying Amount	264,071		264,071		198,949
Aerospace [Member] | Process Technology [Member]
Gross Carrying Value	76,269		76,269		71,716
Accumulated Amortization	(23,334)		(23,334)		(20,622)
Net Carrying Amount	52,935		52,935		51,094
Aerospace [Member] | Customer Relationships [Member]
Gross Carrying Value	272,127		272,127		205,221
Accumulated Amortization	(68,118)		(68,118)		(59,297)
Net Carrying Amount	204,009		204,009		145,924
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	47,323		47,323		39,649
Accumulated Amortization	(40,196)		(40,196)		(37,718)
Net Carrying Amount	7,127		7,127		1,931
Energy [Member]
Gross Carrying Value	87,341		87,341		87,475
Accumulated Amortization	(54,197)		(54,197)		(50,861)
Net Carrying Amount	33,144		33,144		36,614
Energy [Member] | Process Technology [Member]
Gross Carrying Value	23,114		23,114		23,166
Accumulated Amortization	(10,737)		(10,737)		(9,706)
Net Carrying Amount	12,377		12,377		13,460
Energy [Member] | Customer Relationships [Member]
Gross Carrying Value	41,745		41,745		41,770
Accumulated Amortization	(28,105)		(28,105)		(26,623)
Net Carrying Amount	13,640		13,640		15,147
Energy [Member] | Intellectual Property [Member]
Gross Carrying Value	19,949		19,949		20,001
Accumulated Amortization	(13,874)		(13,874)		(13,229)
Net Carrying Amount	6,075		6,075		6,772
Energy [Member] | Other Intangibles [Member]
Gross Carrying Value	2,533		2,533		2,538
Accumulated Amortization	(1,481)		(1,481)		(1,303)
Net Carrying Amount	$ 1,052		$ 1,052		$ 1,235