Intangible Assets, Net (Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization of Finite-Lived Intangible	$ (376,002)	$ (399,081)
Net Carrying Amount - Finite-Lived Intangible	492,044
Intangible Assets, Gross, Total	935,291	1,005,792
Intangible Assets, Net, Total	559,289	606,711
Customer Relationships And Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	685,862	710,932
Accumulated Amortization of Finite-Lived Intangible	(266,895)	(253,565)
Net Carrying Amount - Finite-Lived Intangible	418,967	457,367
Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	15,806	15,778
Accumulated Amortization of Finite-Lived Intangible	(15,806)	(15,640)
Net Carrying Amount - Finite-Lived Intangible		138
Process Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	166,378	167,316
Accumulated Amortization of Finite-Lived Intangible	(93,301)	(86,256)
Net Carrying Amount - Finite-Lived Intangible	73,077	81,060
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible		235
Accumulated Amortization of Finite-Lived Intangible		(183)
Net Carrying Amount - Finite-Lived Intangible		52
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	67,245	68,094
Aerospace [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization of Finite-Lived Intangible	(277,557)	(260,476)
Intangible Assets, Gross, Total	358,053	358,054
Intangible Assets, Net, Total	80,496	97,578
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	(210,380)	(196,520)
Net Carrying Amount - Finite-Lived Intangible	71,303	85,163
Aerospace [Member] | Process Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	76,370	76,371
Accumulated Amortization of Finite-Lived Intangible	(67,177)	(63,956)
Net Carrying Amount - Finite-Lived Intangible	9,193	12,415
Industrial [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization of Finite-Lived Intangible	(98,445)	(138,605)
Intangible Assets, Gross, Total	577,238	647,738
Intangible Assets, Net, Total	478,793	509,133
Industrial [Member] | Customer Relationships And Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	404,179	429,249
Accumulated Amortization of Finite-Lived Intangible	(56,515)	(57,045)
Net Carrying Amount - Finite-Lived Intangible	347,664	372,204
Industrial [Member] | Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	15,806	15,778
Accumulated Amortization of Finite-Lived Intangible	(15,806)	(15,640)
Net Carrying Amount - Finite-Lived Intangible		138
Industrial [Member] | Process Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible	90,008	90,945
Accumulated Amortization of Finite-Lived Intangible	(26,124)	(22,300)
Net Carrying Amount - Finite-Lived Intangible	63,884	68,645
Industrial [Member] | Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value - Finite-Lived Intangible		235
Accumulated Amortization of Finite-Lived Intangible		(183)
Net Carrying Amount - Finite-Lived Intangible		52
Industrial [Member] | Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	$ 67,245	$ 68,094