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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, 2019 | Sep. 30, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total | $ 1,004,526 | $ 1,016,456 |
Accumulated Amortization of Finite-Lived Intangible | (363,045) | (315,573) |
Net Carrying Amount - Finite-Lived Intangible | 575,548 |  |
Intangible Assets, Net, Total | 641,481 | 700,883 | [1]
Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived Intangible Assets | 65,933 | 67,335 |
Customer Relationships And Contracts [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 703,559 | 711,563 |
Accumulated Amortization of Finite-Lived Intangible | (218,315) | (202,575) |
Net Carrying Amount - Finite-Lived Intangible | 485,244 | 508,988 |
Intellectual Property [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 19,354 | 19,448 |
Accumulated Amortization of Finite-Lived Intangible | (18,763) | (18,587) |
Net Carrying Amount - Finite-Lived Intangible | 591 | 861 |
Process Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 172,016 | 173,526 |
Accumulated Amortization of Finite-Lived Intangible | (82,644) | (75,247) |
Net Carrying Amount - Finite-Lived Intangible | 89,372 | 98,279 |
Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 42,066 | 42,955 |
Accumulated Amortization of Finite-Lived Intangible | (42,066) | (18,006) |
Net Carrying Amount - Finite-Lived Intangible | 0 | 24,949 |
Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 1,598 | 1,629 |
Accumulated Amortization of Finite-Lived Intangible | (1,257) | (1,158) |
Net Carrying Amount - Finite-Lived Intangible | 341 | 471 |
Aerospace [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total | 358,054 | 358,055 |
Accumulated Amortization of Finite-Lived Intangible | (236,831) | (221,593) |
Intangible Assets, Net, Total | 121,223 | 136,462 |
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 | (178,177) | (166,719) |
Net Carrying Amount - Finite-Lived Intangible | 103,506 | 114,964 |
Aerospace [Member] | Process Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 76,371 | 76,372 |
Accumulated Amortization of Finite-Lived Intangible | (58,654) | (54,874) |
Net Carrying Amount - Finite-Lived Intangible | 17,717 | 21,498 |
Industrial [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total | 646,472 | 658,401 |
Accumulated Amortization of Finite-Lived Intangible | (126,214) | (93,980) |
Intangible Assets, Net, Total | 520,258 | 564,421 |
Industrial [Member] | Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived Intangible Assets | 65,933 | 67,335 |
Industrial [Member] | Customer Relationships And Contracts [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 421,876 | 429,880 |
Accumulated Amortization of Finite-Lived Intangible | (40,138) | (35,856) |
Net Carrying Amount - Finite-Lived Intangible | 381,738 | 394,024 |
Industrial [Member] | Intellectual Property [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 19,354 | 19,448 |
Accumulated Amortization of Finite-Lived Intangible | (18,763) | (18,587) |
Net Carrying Amount - Finite-Lived Intangible | 591 | 861 |
Industrial [Member] | Process Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 95,645 | 97,154 |
Accumulated Amortization of Finite-Lived Intangible | (23,990) | (20,373) |
Net Carrying Amount - Finite-Lived Intangible | 71,655 | 76,781 |
Industrial [Member] | Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 42,066 | 42,955 |
Accumulated Amortization of Finite-Lived Intangible | (42,066) | (18,006) |
Net Carrying Amount - Finite-Lived Intangible | 0 | 24,949 |
Industrial [Member] | Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 1,598 | 1,629 |
Accumulated Amortization of Finite-Lived Intangible | (1,257) | (1,158) |
Net Carrying Amount - Finite-Lived Intangible | $ 341 | $ 471 |
[1] | The net book value of the backlog and customer relationships and contracts intangible assets was adjusted concurrent with the change in the timing of the associated revenue, resulting in a reduction in the net book value of these assets as of the date of adoption.

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