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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | $ 443,476 |  |  |  | $ 443,445 |  |  |  | $ 443,476 | $ 443,445 |
Accumulated Amortization | (271,594) |  |  |  | (245,795) |  |  |  | (271,594) | (245,795) |
Net Carrying Amount | 171,882 |  |  |  | 197,650 |  |  |  | 171,882 | 197,650 |
Amortization expense | 6,449 | $ 6,439 | $ 6,431 | $ 6,458 | 6,727 | $ 6,887 | $ 6,926 | $ 6,946 | 25,777 | 27,486 | $ 29,241
Process Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 99,555 |  |  |  | 99,570 |  |  |  | 99,555 | 99,570 |
Accumulated Amortization | (66,880) |  |  |  | (59,429) |  |  |  | (66,880) | (59,429) |
Net Carrying Amount | 32,675 |  |  |  | 40,141 |  |  |  | 32,675 | 40,141 |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 323,187 |  |  |  | 323,194 |  |  |  | 323,187 | 323,194 |
Accumulated Amortization | (185,562) |  |  |  | (167,667) |  |  |  | (185,562) | (167,667) |
Net Carrying Amount | 137,625 |  |  |  | 155,527 |  |  |  | 137,625 | 155,527 |
Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 19,422 |  |  |  | 19,435 |  |  |  | 19,422 | 19,435 |
Accumulated Amortization | (18,196) |  |  |  | (17,876) |  |  |  | (18,196) | (17,876) |
Net Carrying Amount | 1,226 |  |  |  | 1,559 |  |  |  | 1,226 | 1,559 |
Other Intangibles [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 1,312 |  |  |  | 1,246 |  |  |  | 1,312 | 1,246 |
Accumulated Amortization | (956) |  |  |  | (823) |  |  |  | (956) | (823) |
Net Carrying Amount | 356 |  |  |  | 423 |  |  |  | 356 | 423 |
Aerospace [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 358,830 |  |  |  | 358,830 |  |  |  | 358,830 | 358,830 |
Accumulated Amortization | (200,279) |  |  |  | (177,387) |  |  |  | (200,279) | (177,387) |
Net Carrying Amount | 158,551 |  |  |  | 181,443 |  |  |  | 158,551 | 181,443 |
Aerospace [Member] | Process Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 76,605 |  |  |  | 76,605 |  |  |  | 76,605 | 76,605 |
Accumulated Amortization | (49,124) |  |  |  | (43,229) |  |  |  | (49,124) | (43,229) |
Net Carrying Amount | 27,481 |  |  |  | 33,376 |  |  |  | 27,481 | 33,376 |
Aerospace [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 282,225 |  |  |  | 282,225 |  |  |  | 282,225 | 282,225 |
Accumulated Amortization | (151,155) |  |  |  | (134,158) |  |  |  | (151,155) | (134,158) |
Net Carrying Amount | 131,070 |  |  |  | 148,067 |  |  |  | 131,070 | 148,067 |
Aerospace [Member] | Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Net Carrying Amount | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Aerospace [Member] | Other Intangibles [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Net Carrying Amount | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 84,646 |  |  |  | 84,615 |  |  |  | 84,646 | 84,615 |
Accumulated Amortization | (71,315) |  |  |  | (68,408) |  |  |  | (71,315) | (68,408) |
Net Carrying Amount | 13,331 |  |  |  | 16,207 |  |  |  | 13,331 | 16,207 |
Industrial [Member] | Process Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 22,950 |  |  |  | 22,965 |  |  |  | 22,950 | 22,965 |
Accumulated Amortization | (17,756) |  |  |  | (16,200) |  |  |  | (17,756) | (16,200) |
Net Carrying Amount | 5,194 |  |  |  | 6,765 |  |  |  | 5,194 | 6,765 |
Industrial [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 40,962 |  |  |  | 40,969 |  |  |  | 40,962 | 40,969 |
Accumulated Amortization | (34,407) |  |  |  | (33,509) |  |  |  | (34,407) | (33,509) |
Net Carrying Amount | 6,555 |  |  |  | 7,460 |  |  |  | 6,555 | 7,460 |
Industrial [Member] | Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 19,422 |  |  |  | 19,435 |  |  |  | 19,422 | 19,435 |
Accumulated Amortization | (18,196) |  |  |  | (17,876) |  |  |  | (18,196) | (17,876) |
Net Carrying Amount | 1,226 |  |  |  | 1,559 |  |  |  | 1,226 | 1,559 |
Industrial [Member] | Other Intangibles [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross Carrying Value | 1,312 |  |  |  | 1,246 |  |  |  | 1,312 | 1,246 |
Accumulated Amortization | (956) |  |  |  | (823) |  |  |  | (956) | (823) |
Net Carrying Amount | $ 356 |  |  |  | $ 423 |  |  |  | $ 356 | $ 423 |

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