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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2015
Gross Carrying Value | $ 443,147 |  | $ 443,147 |  | $ 445,256
Accumulated Amortization | (238,837) |  | (238,837) |  | (220,118)
Net Carrying Amount | 204,310 |  | 204,310 |  | 225,138
Amortization expense | 6,887 | $ 7,224 | 20,759 | $ 22,026 |
Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 99,469 |  | 99,469 |  | 99,529
Accumulated Amortization | (57,523) |  | (57,523) |  | (52,032)
Net Carrying Amount | 41,946 |  | 41,946 |  | 47,497
Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 323,131 |  | 323,131 |  | 323,634
Accumulated Amortization | (162,875) |  | (162,875) |  | (149,123)
Net Carrying Amount | 160,256 |  | 160,256 |  | 174,511
Intellectual Property [Member] |  |  |  |  |
Gross Carrying Value | 19,314 |  | 19,314 |  | 19,445
Accumulated Amortization | (17,644) |  | (17,644) |  | (16,921)
Net Carrying Amount | 1,670 |  | 1,670 |  | 2,524
Other Intangibles [Member] |  |  |  |  |
Gross Carrying Value | 1,233 |  | 1,233 |  | 2,648
Accumulated Amortization | (795) |  | (795) |  | (2,042)
Net Carrying Amount | 438 |  | 438 |  | 606
Aerospace [Member] |  |  |  |  |
Gross Carrying Value | 358,830 |  | 358,830 |  | 360,230
Accumulated Amortization | (171,450) |  | (171,450) |  | (154,943)
Net Carrying Amount | 187,380 |  | 187,380 |  | 205,287
Aerospace [Member] | Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 76,605 |  | 76,605 |  | 76,605
Accumulated Amortization | (41,775) |  | (41,775) |  | (37,411)
Net Carrying Amount | 34,830 |  | 34,830 |  | 39,194
Aerospace [Member] | Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 282,225 |  | 282,225 |  | 282,225
Accumulated Amortization | (129,675) |  | (129,675) |  | (116,232)
Net Carrying Amount | 152,550 |  | 152,550 |  | 165,993
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 |  | 1,400
Accumulated Amortization | 0 |  | 0 |  | (1,300)
Net Carrying Amount | 0 |  | 0 |  | 100
Industrial [Member] |  |  |  |  |
Gross Carrying Value | 84,317 |  | 84,317 |  | 85,026
Accumulated Amortization | (67,387) |  | (67,387) |  | (65,175)
Net Carrying Amount | 16,930 |  | 16,930 |  | 19,851
Industrial [Member] | Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 22,864 |  | 22,864 |  | 22,924
Accumulated Amortization | (15,748) |  | (15,748) |  | (14,621)
Net Carrying Amount | 7,116 |  | 7,116 |  | 8,303
Industrial [Member] | Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 40,906 |  | 40,906 |  | 41,409
Accumulated Amortization | (33,200) |  | (33,200) |  | (32,891)
Net Carrying Amount | 7,706 |  | 7,706 |  | 8,518
Industrial [Member] | Intellectual Property [Member] |  |  |  |  |
Gross Carrying Value | 19,314 |  | 19,314 |  | 19,445
Accumulated Amortization | (17,644) |  | (17,644) |  | (16,921)
Net Carrying Amount | 1,670 |  | 1,670 |  | 2,524
Industrial [Member] | Other Intangibles [Member] |  |  |  |  |
Gross Carrying Value | 1,233 |  | 1,233 |  | 1,248
Accumulated Amortization | (795) |  | (795) |  | (742)
Net Carrying Amount | $ 438 |  | $ 438 |  | $ 506

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