Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
Gross Carrying Value	$ 444,448		$ 445,256
Accumulated Amortization	(226,378)		(220,118)
Net Carrying Amount	218,070		225,138
Amortization expense	6,946	$ 7,575
Process Technology [Member]
Gross Carrying Value	99,425		99,529
Accumulated Amortization	(53,817)		(52,032)
Net Carrying Amount	45,608		47,497
Customer Relationships [Member]
Gross Carrying Value	323,083		323,634
Accumulated Amortization	(153,345)		(149,123)
Net Carrying Amount	169,738		174,511
Intellectual Property [Member]
Gross Carrying Value	19,327		19,445
Accumulated Amortization	(17,124)		(16,921)
Net Carrying Amount	2,203		2,524
Other Intangibles [Member]
Gross Carrying Value	2,613		2,648
Accumulated Amortization	(2,092)		(2,042)
Net Carrying Amount	521		606
Aerospace [Member]
Gross Carrying Value	360,230		360,230
Accumulated Amortization	(160,928)		(154,943)
Net Carrying Amount	199,302		205,287
Aerospace [Member] | Process Technology [Member]
Gross Carrying Value	76,605		76,605
Accumulated Amortization	(38,866)		(37,411)
Net Carrying Amount	37,739		39,194
Aerospace [Member] | Customer Relationships [Member]
Gross Carrying Value	282,225		282,225
Accumulated Amortization	(120,712)		(116,232)
Net Carrying Amount	161,513		165,993
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	1,400		1,400
Accumulated Amortization	(1,350)		(1,300)
Net Carrying Amount	50		100
Industrial [Member]
Gross Carrying Value	84,218		85,026
Accumulated Amortization	(65,450)		(65,175)
Net Carrying Amount	18,768		19,851
Industrial [Member] | Process Technology [Member]
Gross Carrying Value	22,820		22,924
Accumulated Amortization	(14,951)		(14,621)
Net Carrying Amount	7,869		8,303
Industrial [Member] | Customer Relationships [Member]
Gross Carrying Value	40,858		41,409
Accumulated Amortization	(32,633)		(32,891)
Net Carrying Amount	8,225		8,518
Industrial [Member] | Intellectual Property [Member]
Gross Carrying Value	19,327		19,445
Accumulated Amortization	(17,124)		(16,921)
Net Carrying Amount	2,203		2,524
Industrial [Member] | Other Intangibles [Member]
Gross Carrying Value	1,213		1,248
Accumulated Amortization	(742)		(742)
Net Carrying Amount	$ 471		$ 506