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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, 2019 | Sep. 30, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total | $ 996,942 | $ 1,016,456 |
Accumulated Amortization of Finite-Lived Intangible | (350,848) | (315,573) |
Net Carrying Amount - Finite-Lived Intangible | 581,027 |  |
Intangible Assets, Net, Total | 646,094 | 700,883 | [1]
Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived Intangible Assets | 65,067 | 67,335 |
Accumulated Amortization of Finite-Lived Intangible |  |  |
Customer Relationships And Contracts [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 698,534 | 711,563 |
Accumulated Amortization of Finite-Lived Intangible | (212,064) | (202,575) |
Net Carrying Amount - Finite-Lived Intangible | 486,470 | 508,988 |
Intellectual Property [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 19,325 | 19,448 |
Accumulated Amortization of Finite-Lived Intangible | (18,650) | (18,587) |
Net Carrying Amount - Finite-Lived Intangible | 675 | 861 |
Process Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 170,925 | 173,526 |
Accumulated Amortization of Finite-Lived Intangible | (80,019) | (75,247) |
Net Carrying Amount - Finite-Lived Intangible | 90,906 | 98,279 |
Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 41,516 | 42,955 |
Accumulated Amortization of Finite-Lived Intangible | (38,916) | (18,006) |
Net Carrying Amount - Finite-Lived Intangible | 2,600 | 24,949 |
Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 1,575 | 1,629 |
Accumulated Amortization of Finite-Lived Intangible | (1,199) | (1,158) |
Net Carrying Amount - Finite-Lived Intangible | 376 | 471 |
Aerospace [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total | 358,054 | 358,055 |
Accumulated Amortization of Finite-Lived Intangible | (231,752) | (221,593) |
Intangible Assets, Net, Total | 126,302 | 136,462 |
Aerospace [Member] | Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived Intangible Assets |  |  |
Accumulated Amortization of Finite-Lived Intangible |  |  |
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 | (174,359) | (166,719) |
Net Carrying Amount - Finite-Lived Intangible | 107,324 | 114,964 |
Aerospace [Member] | Intellectual Property [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible |  |  |
Accumulated Amortization of Finite-Lived Intangible |  |  |
Net Carrying Amount - Finite-Lived Intangible |  |  |
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 | (57,393) | (54,874) |
Net Carrying Amount - Finite-Lived Intangible | 18,978 | 21,498 |
Aerospace [Member] | Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible |  |  |
Accumulated Amortization of Finite-Lived Intangible |  |  |
Net Carrying Amount - Finite-Lived Intangible |  |  |
Aerospace [Member] | Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible |  |  |
Accumulated Amortization of Finite-Lived Intangible |  |  |
Net Carrying Amount - Finite-Lived Intangible |  |  |
Industrial [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible Assets, Gross, Total | 638,888 | 658,401 |
Accumulated Amortization of Finite-Lived Intangible | (119,096) | (93,980) |
Intangible Assets, Net, Total | 519,792 | 564,421 |
Industrial [Member] | Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived Intangible Assets | 65,067 | 67,335 |
Accumulated Amortization of Finite-Lived Intangible |  |  |
Industrial [Member] | Customer Relationships And Contracts [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 416,851 | 429,880 |
Accumulated Amortization of Finite-Lived Intangible | (37,705) | (35,856) |
Net Carrying Amount - Finite-Lived Intangible | 379,146 | 394,024 |
Industrial [Member] | Intellectual Property [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 19,325 | 19,448 |
Accumulated Amortization of Finite-Lived Intangible | (18,650) | (18,587) |
Net Carrying Amount - Finite-Lived Intangible | 675 | 861 |
Industrial [Member] | Process Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 94,554 | 97,154 |
Accumulated Amortization of Finite-Lived Intangible | (22,626) | (20,373) |
Net Carrying Amount - Finite-Lived Intangible | 71,928 | 76,781 |
Industrial [Member] | Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 41,516 | 42,955 |
Accumulated Amortization of Finite-Lived Intangible | (38,916) | (18,006) |
Net Carrying Amount - Finite-Lived Intangible | 2,600 | 24,949 |
Industrial [Member] | Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value - Finite-Lived Intangible | 1,575 | 1,629 |
Accumulated Amortization of Finite-Lived Intangible | (1,199) | (1,158) |
Net Carrying Amount - Finite-Lived Intangible | $ 376 | $ 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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