Intangible Assets, Net (Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization of Finite-Lived Intangible	$ (389,712)	$ (376,002)
Net Carrying Amount - Finite-Lived Intangible	457,784
Intangible Assets, Gross, Total	912,214	935,291
Intangible Assets, Net, Total	522,502	559,289
Customer Relationships And Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	671,440	685,862
Accumulated Amortization of Finite-Lived Intangible	(281,484)	(266,895)
Net Carrying Amount - Finite-Lived Intangible	389,956	418,967
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	12,466	15,806
Accumulated Amortization of Finite-Lived Intangible	(12,466)	(15,806)
Process Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	163,590	166,378
Accumulated Amortization of Finite-Lived Intangible	(95,762)	(93,301)
Net Carrying Amount - Finite-Lived Intangible	67,828	73,077
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	64,718	67,245
Aerospace [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization of Finite-Lived Intangible	(285,297)	(277,557)
Intangible Assets, Gross, Total	358,053	358,053
Intangible Assets, Net, Total	72,756	80,496
Aerospace [Member] | Customer Relationships And Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	281,683	281,683
Accumulated Amortization of Finite-Lived Intangible	(216,973)	(210,380)
Net Carrying Amount - Finite-Lived Intangible	64,710	71,303
Aerospace [Member] | Process Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	76,370	76,370
Accumulated Amortization of Finite-Lived Intangible	(68,324)	(67,177)
Net Carrying Amount - Finite-Lived Intangible	8,046	9,193
Industrial [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization of Finite-Lived Intangible	(104,415)	(98,445)
Intangible Assets, Gross, Total	554,161	577,238
Intangible Assets, Net, Total	449,746	478,793
Industrial [Member] | Customer Relationships And Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	389,757	404,179
Accumulated Amortization of Finite-Lived Intangible	(64,511)	(56,515)
Net Carrying Amount - Finite-Lived Intangible	325,246	347,664
Industrial [Member] | Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	12,466	15,806
Accumulated Amortization of Finite-Lived Intangible	(12,466)	(15,806)
Industrial [Member] | Process Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	87,220	90,008
Accumulated Amortization of Finite-Lived Intangible	(27,438)	(26,124)
Net Carrying Amount - Finite-Lived Intangible	59,782	63,884
Industrial [Member] | Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	$ 64,718	$ 67,245