Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
Gross Carrying Value	$ 494,017		$ 494,017		$ 494,609
Accumulated Amortization	(230,527)		(230,527)		(205,834)
Net Carrying Amount	263,490		263,490		288,775
Amortization expense	8,357	9,769	25,498	27,249
Process Technology [Member]
Gross Carrying Value	99,943		99,943		100,176
Accumulated Amortization	(43,016)		(43,016)		(37,828)
Net Carrying Amount	56,927		56,927		62,348
Customer Relationships [Member]
Gross Carrying Value	323,760		323,760		324,233
Accumulated Amortization	(123,595)		(123,595)		(106,999)
Net Carrying Amount	200,165		200,165		217,234
Intellectual Property [Member]
Gross Carrying Value	20,296		20,296		20,218
Accumulated Amortization	(15,821)		(15,821)		(14,722)
Net Carrying Amount	4,475		4,475		5,496
Other Intangibles [Member]
Gross Carrying Value	50,018		50,018		49,982
Accumulated Amortization	(48,095)		(48,095)		(46,285)
Net Carrying Amount	1,923		1,923		3,697
Aerospace [Member]
Gross Carrying Value	405,419		405,419		406,294
Accumulated Amortization	(168,011)		(168,011)		(147,989)
Net Carrying Amount	237,408		237,408		258,305
Aerospace [Member] | Process Technology [Member]
Gross Carrying Value	76,372		76,372		76,718
Accumulated Amortization	(30,077)		(30,077)		(26,129)
Net Carrying Amount	46,295		46,295		50,589
Aerospace [Member] | Customer Relationships [Member]
Gross Carrying Value	281,683		281,683		282,225
Accumulated Amortization	(91,729)		(91,729)		(77,288)
Net Carrying Amount	189,954		189,954		204,937
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	47,364		47,364		47,351
Accumulated Amortization	(46,205)		(46,205)		(44,572)
Net Carrying Amount	1,159		1,159		2,779
Energy [Member]
Gross Carrying Value	88,598		88,598		88,315
Accumulated Amortization	(62,516)		(62,516)		(57,845)
Net Carrying Amount	26,082		26,082		30,470
Energy [Member] | Process Technology [Member]
Gross Carrying Value	23,571		23,571		23,458
Accumulated Amortization	(12,939)		(12,939)		(11,699)
Net Carrying Amount	10,632		10,632		11,759
Energy [Member] | Customer Relationships [Member]
Gross Carrying Value	42,077		42,077		42,008
Accumulated Amortization	(31,866)		(31,866)		(29,711)
Net Carrying Amount	10,211		10,211		12,297
Energy [Member] | Intellectual Property [Member]
Gross Carrying Value	20,296		20,296		20,218
Accumulated Amortization	(15,821)		(15,821)		(14,722)
Net Carrying Amount	4,475		4,475		5,496
Energy [Member] | Other Intangibles [Member]
Gross Carrying Value	2,654		2,654		2,631
Accumulated Amortization	(1,890)		(1,890)		(1,713)
Net Carrying Amount	$ 764		$ 764		$ 918