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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, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Sep. 30, 2014
Gross Carrying Value | $ 453,609 |  | $ 453,609 |  | $ 454,187
Accumulated Amortization | (220,992) |  | (220,992) |  | (199,415)
Net Carrying Amount | 232,617 |  | 232,617 |  | 254,772
Amortization expense | 7,224 | $ 8,357 | 22,026 | $ 25,498 |
Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 99,885 |  | 99,885 |  | 99,683
Accumulated Amortization | (50,401) |  | (50,401) |  | (44,860)
Net Carrying Amount | 49,484 |  | 49,484 |  | 54,823
Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 323,791 |  | 323,791 |  | 323,931
Accumulated Amortization | (144,192) |  | (144,192) |  | (129,313)
Net Carrying Amount | 179,599 |  | 179,599 |  | 194,618
Intellectual Property [Member] |  |  |  |  |
Gross Carrying Value | 19,473 |  | 19,473 |  | 19,954
Accumulated Amortization | (16,616) |  | (16,616) |  | (15,938)
Net Carrying Amount | 2,857 |  | 2,857 |  | 4,016
Other Intangibles [Member] |  |  |  |  |
Gross Carrying Value | 10,460 |  | 10,460 |  | 10,619
Accumulated Amortization | (9,783) |  | (9,783) |  | (9,304)
Net Carrying Amount | 677 |  | 677 |  | 1,315
Aerospace [Member] |  |  |  |  |
Gross Carrying Value | 367,930 |  | 367,930 |  | 367,930
Accumulated Amortization | (156,434) |  | (156,434) |  | (137,465)
Net Carrying Amount | 211,496 |  | 211,496 |  | 230,465
Aerospace [Member] | Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 76,605 |  | 76,605 |  | 76,605
Accumulated Amortization | (35,989) |  | (35,989) |  | (31,719)
Net Carrying Amount | 40,616 |  | 40,616 |  | 44,886
Aerospace [Member] | Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 282,225 |  | 282,225 |  | 282,225
Accumulated Amortization | (111,495) |  | (111,495) |  | (97,281)
Net Carrying Amount | 170,730 |  | 170,730 |  | 184,944
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 | 9,100 |  | 9,100 |  | 9,100
Accumulated Amortization | (8,950) |  | (8,950) |  | (8,465)
Net Carrying Amount | 150 |  | 150 |  | 635
Energy [Member] |  |  |  |  |
Gross Carrying Value | 85,679 |  | 85,679 |  | 86,257
Accumulated Amortization | (64,558) |  | (64,558) |  | (61,950)
Net Carrying Amount | 21,121 |  | 21,121 |  | 24,307
Energy [Member] | Process Technology [Member] |  |  |  |  |
Gross Carrying Value | 23,280 |  | 23,280 |  | 23,078
Accumulated Amortization | (14,412) |  | (14,412) |  | (13,141)
Net Carrying Amount | 8,868 |  | 8,868 |  | 9,937
Energy [Member] | Customer Relationships [Member] |  |  |  |  |
Gross Carrying Value | 41,566 |  | 41,566 |  | 41,706
Accumulated Amortization | (32,697) |  | (32,697) |  | (32,032)
Net Carrying Amount | 8,869 |  | 8,869 |  | 9,674
Energy [Member] | Intellectual Property [Member] |  |  |  |  |
Gross Carrying Value | 19,473 |  | 19,473 |  | 19,954
Accumulated Amortization | (16,616) |  | (16,616) |  | (15,938)
Net Carrying Amount | 2,857 |  | 2,857 |  | 4,016
Energy [Member] | Other Intangibles [Member] |  |  |  |  |
Gross Carrying Value | 1,360 |  | 1,360 |  | 1,519
Accumulated Amortization | (833) |  | (833) |  | (839)
Net Carrying Amount | $ 527 |  | $ 527 |  | $ 680

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