Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Gross Carrying Value	$ 495,047		$ 494,609
Accumulated Amortization	(214,518)		(205,834)
Net Carrying Amount	280,529		288,775
Amortization expense	8,484	7,667
Process Technology [Member]
Gross Carrying Value	100,332		100,176
Accumulated Amortization	(39,688)		(37,828)
Net Carrying Amount	60,644		62,348
Customer Relationships [Member]
Gross Carrying Value	324,370		324,233
Accumulated Amortization	(112,776)		(106,999)
Net Carrying Amount	211,594		217,234
Intellectual Property [Member]
Gross Carrying Value	20,316		20,218
Accumulated Amortization	(15,129)		(14,722)
Net Carrying Amount	5,187		5,496
Other Intangibles [Member]
Gross Carrying Value	50,029		49,982
Accumulated Amortization	(46,925)		(46,285)
Net Carrying Amount	3,104		3,697
Aerospace [Member]
Gross Carrying Value	406,351		406,294
Accumulated Amortization	(154,940)		(147,989)
Net Carrying Amount	251,411		258,305
Aerospace [Member] | Process Technology [Member]
Gross Carrying Value	76,734		76,718
Accumulated Amortization	(27,545)		(26,129)
Net Carrying Amount	49,189		50,589
Aerospace [Member] | Customer Relationships [Member]
Gross Carrying Value	282,257		282,225
Accumulated Amortization	(82,266)		(77,288)
Net Carrying Amount	199,991		204,937
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	47,360		47,351
Accumulated Amortization	(45,129)		(44,572)
Net Carrying Amount	2,231		2,779
Energy [Member]
Gross Carrying Value	88,696		88,315
Accumulated Amortization	(59,578)		(57,845)
Net Carrying Amount	29,118		30,470
Energy [Member] | Process Technology [Member]
Gross Carrying Value	23,598		23,458
Accumulated Amortization	(12,143)		(11,699)
Net Carrying Amount	11,455		11,759
Energy [Member] | Customer Relationships [Member]
Gross Carrying Value	42,113		42,008
Accumulated Amortization	(30,510)		(29,711)
Net Carrying Amount	11,603		12,297
Energy [Member] | Intellectual Property [Member]
Gross Carrying Value	20,316		20,218
Accumulated Amortization	(15,129)		(14,722)
Net Carrying Amount	5,187		5,496
Energy [Member] | Other Intangibles [Member]
Gross Carrying Value	2,669		2,631
Accumulated Amortization	(1,796)		(1,713)
Net Carrying Amount	$ 873		$ 918