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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2016
Gross Carrying Value | $ 443,490 |  | $ 443,490 |  | $ 443,445
Accumulated Amortization | (265,153) |  | (265,153) |  | (245,795)
Net Carrying Amount | 178,337 |  | 178,337 |  | 197,650
Amortization expense | 6,439 | $ 6,887 | 19,328 | $ 20,759 |
Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 99,648 |  | 99,648 |  | 99,570
Accumulated Amortization | (65,084) |  | (65,084) |  | (59,429)
Net Carrying Amount | 34,564 |  | 34,564 |  | 40,141
Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 323,228 |  | 323,228 |  | 323,194
Accumulated Amortization | (181,119) |  | (181,119) |  | (167,667)
Net Carrying Amount | 142,109 |  | 142,109 |  | 155,527
Intellectual Property [Member] |  |  |  |  |
Gross Carrying Value | 19,344 |  | 19,344 |  | 19,435
Accumulated Amortization | (18,047) |  | (18,047) |  | (17,876)
Net Carrying Amount | 1,297 |  | 1,297 |  | 1,559
Other Intangibles [Member] |  |  |  |  |
Gross Carrying Value | 1,270 |  | 1,270 |  | 1,246
Accumulated Amortization | (903) |  | (903) |  | (823)
Net Carrying Amount | 367 |  | 367 |  | 423
Aerospace [Member] |  |  |  |  |
Gross Carrying Value | 358,830 |  | 358,830 |  | 358,830
Accumulated Amortization | (194,556) |  | (194,556) |  | (177,387)
Net Carrying Amount | 164,274 |  | 164,274 |  | 181,443
Aerospace [Member] | Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 76,605 |  | 76,605 |  | 76,605
Accumulated Amortization | (47,651) |  | (47,651) |  | (43,229)
Net Carrying Amount | 28,954 |  | 28,954 |  | 33,376
Aerospace [Member] | Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 282,225 |  | 282,225 |  | 282,225
Accumulated Amortization | (146,905) |  | (146,905) |  | (134,158)
Net Carrying Amount | 135,320 |  | 135,320 |  | 148,067
Aerospace [Member] | Intellectual Property [Member] |  |  |  |  |
Gross Carrying Value | 0 |  | 0 |  | 0
Accumulated Amortization | 0 |  | 0 |  | 0
Net Carrying Amount | 0 |  | 0 |  | 0
Aerospace [Member] | Other Intangibles [Member] |  |  |  |  |
Gross Carrying Value | 0 |  | 0 |  | 0
Accumulated Amortization | 0 |  | 0 |  | 0
Net Carrying Amount | 0 |  | 0 |  | 0
Industrial [Member] |  |  |  |  |
Gross Carrying Value | 84,660 |  | 84,660 |  | 84,615
Accumulated Amortization | (70,597) |  | (70,597) |  | (68,408)
Net Carrying Amount | 14,063 |  | 14,063 |  | 16,207
Industrial [Member] | Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 23,043 |  | 23,043 |  | 22,965
Accumulated Amortization | (17,433) |  | (17,433) |  | (16,200)
Net Carrying Amount | 5,610 |  | 5,610 |  | 6,765
Industrial [Member] | Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 41,003 |  | 41,003 |  | 40,969
Accumulated Amortization | (34,214) |  | (34,214) |  | (33,509)
Net Carrying Amount | 6,789 |  | 6,789 |  | 7,460
Industrial [Member] | Intellectual Property [Member] |  |  |  |  |
Gross Carrying Value | 19,344 |  | 19,344 |  | 19,435
Accumulated Amortization | (18,047) |  | (18,047) |  | (17,876)
Net Carrying Amount | 1,297 |  | 1,297 |  | 1,559
Industrial [Member] | Other Intangibles [Member] |  |  |  |  |
Gross Carrying Value | 1,270 |  | 1,270 |  | 1,246
Accumulated Amortization | (903) |  | (903) |  | (823)
Net Carrying Amount | $ 367 |  | $ 367 |  | $ 423

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