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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | $ 443,503 |  | $ 443,503 |  | $ 443,476
Accumulated Amortization | (284,055) |  | (284,055) |  | (271,594)
Net Carrying Amount | 159,448 |  | 159,448 |  | 171,882
Amortization expense | 6,258 | $ 6,431 | 12,501 | $ 12,889 |
Process Technology [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 99,434 |  | 99,434 |  | 99,555
Accumulated Amortization | (70,516) |  | (70,516) |  | (66,880)
Net Carrying Amount | 28,918 |  | 28,918 |  | 32,675
Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 322,868 |  | 322,868 |  | 323,187
Accumulated Amortization | (193,730) |  | (193,730) |  | (185,562)
Net Carrying Amount | 129,138 |  | 129,138 |  | 137,625
Intellectual Property [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 19,723 |  | 19,723 |  | 19,422
Accumulated Amortization | (18,657) |  | (18,657) |  | (18,196)
Net Carrying Amount | 1,066 |  | 1,066 |  | 1,226
Other Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 1,478 |  | 1,478 |  | 1,312
Accumulated Amortization | (1,152) |  | (1,152) |  | (956)
Net Carrying Amount | 326 |  | 326 |  | 356
Aerospace [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 358,055 |  | 358,055 |  | 358,830
Accumulated Amortization | (210,547) |  | (210,547) |  | (200,279)
Net Carrying Amount | 147,508 |  | 147,508 |  | 158,551
Aerospace [Member] | Process Technology [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 76,372 |  | 76,372 |  | 76,605
Accumulated Amortization | (51,881) |  | (51,881) |  | (49,124)
Net Carrying Amount | 24,491 |  | 24,491 |  | 27,481
Aerospace [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 281,683 |  | 281,683 |  | 282,225
Accumulated Amortization | (158,666) |  | (158,666) |  | (151,155)
Net Carrying Amount | 123,017 |  | 123,017 |  | 131,070
Aerospace [Member] | Intellectual Property [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 0 |  | 0 |  | 0
Accumulated Amortization | 0 |  | 0 |  | 0
Net Carrying Amount | 0 |  | 0 |  | 0
Aerospace [Member] | Other Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 0 |  | 0 |  | 0
Accumulated Amortization | 0 |  | 0 |  | 0
Net Carrying Amount | 0 |  | 0 |  | 0
Industrial [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 85,448 |  | 85,448 |  | 84,646
Accumulated Amortization | (73,508) |  | (73,508) |  | (71,315)
Net Carrying Amount | 11,940 |  | 11,940 |  | 13,331
Industrial [Member] | Process Technology [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 23,062 |  | 23,062 |  | 22,950
Accumulated Amortization | (18,635) |  | (18,635) |  | (17,756)
Net Carrying Amount | 4,427 |  | 4,427 |  | 5,194
Industrial [Member] | Customer Relationships [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 41,185 |  | 41,185 |  | 40,962
Accumulated Amortization | (35,064) |  | (35,064) |  | (34,407)
Net Carrying Amount | 6,121 |  | 6,121 |  | 6,555
Industrial [Member] | Intellectual Property [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 19,723 |  | 19,723 |  | 19,422
Accumulated Amortization | (18,657) |  | (18,657) |  | (18,196)
Net Carrying Amount | 1,066 |  | 1,066 |  | 1,226
Industrial [Member] | Other Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Value | 1,478 |  | 1,478 |  | 1,312
Accumulated Amortization | (1,152) |  | (1,152) |  | (956)
Net Carrying Amount | $ 326 |  | $ 326 |  | $ 356

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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