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Intangible Assets, Net (Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization of Finite-Lived Intangible | $ (386,022) | $ (371,274)
Net Carrying Amount - Finite-Lived Intangible | 529,974 |
Intangible Assets, Gross, Total | 981,180 | 983,266
Intangible Assets, Net, Total | 595,158 | 611,992
Customer Relationships And Contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 694,327 | 689,366
Accumulated Amortization of Finite-Lived Intangible | (244,773) | (225,981)
Net Carrying Amount - Finite-Lived Intangible | 449,554 | 463,385
Intellectual Property [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 15,750 | 19,201
Accumulated Amortization of Finite-Lived Intangible | (15,565) | (18,705)
Net Carrying Amount - Finite-Lived Intangible | 185 | 496
Process Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 164,104 | 169,191
Accumulated Amortization of Finite-Lived Intangible | (83,938) | (84,839)
Net Carrying Amount - Finite-Lived Intangible | 80,166 | 84,352
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 41,590 | 40,500
Accumulated Amortization of Finite-Lived Intangible | (41,590) | (40,500)
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 225 | 1,541
Accumulated Amortization of Finite-Lived Intangible | (156) | (1,249)
Net Carrying Amount - Finite-Lived Intangible | 69 | 292
Tradenames [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | 65,184 | 63,467
Aerospace [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization of Finite-Lived Intangible | (255,836) | (241,908)
Intangible Assets, Gross, Total | 358,054 | 358,054
Intangible Assets, Net, Total | 102,218 | 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 | (192,890) | (181,995)
Net Carrying Amount - Finite-Lived Intangible | 88,793 | 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 | (62,946) | (59,913)
Net Carrying Amount - Finite-Lived Intangible | 13,425 | 16,458
Industrial [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization of Finite-Lived Intangible | (130,186) | (129,366)
Intangible Assets, Gross, Total | 623,126 | 625,212
Intangible Assets, Net, Total | 492,940 | 495,846
Industrial [Member] | Customer Relationships And Contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 412,644 | 407,683
Accumulated Amortization of Finite-Lived Intangible | (51,883) | (43,986)
Net Carrying Amount - Finite-Lived Intangible | 360,761 | 363,697
Industrial [Member] | Intellectual Property [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 15,750 | 19,201
Accumulated Amortization of Finite-Lived Intangible | (15,565) | (18,705)
Net Carrying Amount - Finite-Lived Intangible | 185 | 496
Industrial [Member] | Process Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 87,733 | 92,820
Accumulated Amortization of Finite-Lived Intangible | (20,992) | (24,926)
Net Carrying Amount - Finite-Lived Intangible | 66,741 | 67,894
Industrial [Member] | Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 41,590 | 40,500
Accumulated Amortization of Finite-Lived Intangible | (41,590) | (40,500)
Industrial [Member] | Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value - Finite-Lived Intangible | 225 | 1,541
Accumulated Amortization of Finite-Lived Intangible | (156) | (1,249)
Net Carrying Amount - Finite-Lived Intangible | 69 | 292
Industrial [Member] | Tradenames [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-Lived Intangible Assets | $ 65,184 | $ 63,467

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