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Intangible Assets, Net (Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization of Finite-Lived Intangible $ (399,081) $ (371,274)
Net Carrying Amount - Finite-Lived Intangible 538,617  
Intangible Assets, Gross, Total 1,005,792 983,266
Intangible Assets, Net, Total 606,711 611,992
Customer Relationships And Contracts [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 710,932 689,366
Accumulated Amortization of Finite-Lived Intangible (253,565) (225,981)
Net Carrying Amount - Finite-Lived Intangible 457,367 463,385
Intellectual Property [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 15,778 19,201
Accumulated Amortization of Finite-Lived Intangible (15,640) (18,705)
Net Carrying Amount - Finite-Lived Intangible 138 496
Process Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 167,316 169,191
Accumulated Amortization of Finite-Lived Intangible (86,256) (84,839)
Net Carrying Amount - Finite-Lived Intangible 81,060 84,352
Other Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 235 1,541
Accumulated Amortization of Finite-Lived Intangible (183) (1,249)
Net Carrying Amount - Finite-Lived Intangible 52 292
Trade Name [Member]    
Finite Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 68,094 63,467
Aerospace [Member]    
Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization of Finite-Lived Intangible (260,476) (241,908)
Intangible Assets, Gross, Total 358,054 358,054
Intangible Assets, Net, Total 97,578 116,146
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 (196,520) (181,995)
Net Carrying Amount - Finite-Lived Intangible 85,163 99,688
Aerospace [Member] | Process Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 76,371 76,371
Accumulated Amortization of Finite-Lived Intangible (63,956) (59,913)
Net Carrying Amount - Finite-Lived Intangible 12,415 16,458
Industrial [Member]    
Finite Lived Intangible Assets [Line Items]    
Accumulated Amortization of Finite-Lived Intangible (138,605) (129,366)
Intangible Assets, Gross, Total 647,738 625,212
Intangible Assets, Net, Total 509,133 495,846
Industrial [Member] | Customer Relationships And Contracts [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 429,249 407,683
Accumulated Amortization of Finite-Lived Intangible (57,045) (43,986)
Net Carrying Amount - Finite-Lived Intangible 372,204 363,697
Industrial [Member] | Intellectual Property [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 15,778 19,201
Accumulated Amortization of Finite-Lived Intangible (15,640) (18,705)
Net Carrying Amount - Finite-Lived Intangible 138 496
Industrial [Member] | Process Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 90,945 92,820
Accumulated Amortization of Finite-Lived Intangible (22,300) (24,926)
Net Carrying Amount - Finite-Lived Intangible 68,645 67,894
Industrial [Member] | Other Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 235 1,541
Accumulated Amortization of Finite-Lived Intangible (183) (1,249)
Net Carrying Amount - Finite-Lived Intangible 52 292
Industrial [Member] | Trade Name [Member]    
Finite Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets $ 68,094 $ 63,467