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Intangible Assets, Net (Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross, Total | $ 971,480 | $ 983,266
Accumulated Amortization of Finite-Lived Intangible | (375,290) | (371,274)
Net Carrying Amount - Finite-Lived Intangible | 532,156 |
Intangible Assets, Net, Total | 596,190 | 611,992
Trade Name [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | 64,034 | 63,467
Customer Relationships And Contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 687,770 | 689,366
Accumulated Amortization of Finite-Lived Intangible | (236,847) | (225,981)
Net Carrying Amount - Finite-Lived Intangible | 450,923 | 463,385
Intellectual Property [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 15,703 | 19,201
Accumulated Amortization of Finite-Lived Intangible | (15,513) | (18,705)
Net Carrying Amount - Finite-Lived Intangible | 190 | 496
Process Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 162,908 | 169,191
Accumulated Amortization of Finite-Lived Intangible | (81,929) | (84,839)
Net Carrying Amount - Finite-Lived Intangible | 80,979 | 84,352
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 40,860 | 40,500
Accumulated Amortization of Finite-Lived Intangible | (40,860) | (40,500)
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 205 | 1,541
Accumulated Amortization of Finite-Lived Intangible | (141) | (1,249)
Net Carrying Amount - Finite-Lived Intangible | 64 | 292
Aerospace [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross, Total | 358,054 | 358,054
Accumulated Amortization of Finite-Lived Intangible | (251,191) | (241,908)
Intangible Assets, Net, Total | 106,863 | 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 | (189,258) | (181,995)
Net Carrying Amount - Finite-Lived Intangible | 92,425 | 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 | (61,933) | (59,913)
Net Carrying Amount - Finite-Lived Intangible | 14,438 | 16,458
Industrial [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets, Gross, Total | 613,426 | 625,212
Accumulated Amortization of Finite-Lived Intangible | (124,099) | (129,366)
Intangible Assets, Net, Total | 489,327 | 495,846
Industrial [Member] | Trade Name [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | 64,034 | 63,467
Industrial [Member] | Customer Relationships And Contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 406,087 | 407,683
Accumulated Amortization of Finite-Lived Intangible | (47,589) | (43,986)
Net Carrying Amount - Finite-Lived Intangible | 358,498 | 363,697
Industrial [Member] | Intellectual Property [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 15,703 | 19,201
Accumulated Amortization of Finite-Lived Intangible | (15,513) | (18,705)
Net Carrying Amount - Finite-Lived Intangible | 190 | 496
Industrial [Member] | Process Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 86,537 | 92,820
Accumulated Amortization of Finite-Lived Intangible | (19,996) | (24,926)
Net Carrying Amount - Finite-Lived Intangible | 66,541 | 67,894
Industrial [Member] | Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 40,860 | 40,500
Accumulated Amortization of Finite-Lived Intangible | (40,860) | (40,500)
Industrial [Member] | Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 205 | 1,541
Accumulated Amortization of Finite-Lived Intangible | (141) | (1,249)
Net Carrying Amount - Finite-Lived Intangible | $ 64 | $ 292

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