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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Gross Carrying Value | $ 454,187 | $ 494,609 |
Accumulated Amortization | (199,415) | (205,834) |
Net Carrying Amount | 254,772 | 288,775 |
Amortization expense | 33,580 | 36,979 | 32,809
Process Technology [Member] |  |  |
Gross Carrying Value | 99,683 | 100,176 |
Accumulated Amortization | (44,860) | (37,828) |
Net Carrying Amount | 54,823 | 62,348 |
Customer Relationships [Member] |  |  |
Gross Carrying Value | 323,931 | 324,233 |
Accumulated Amortization | (129,313) | (106,999) |
Net Carrying Amount | 194,618 | 217,234 |
Intellectual Property [Member] |  |  |
Gross Carrying Value | 19,954 | 20,218 |
Accumulated Amortization | (15,938) | (14,722) |
Net Carrying Amount | 4,016 | 5,496 |
Other Intangibles [Member] |  |  |
Gross Carrying Value | 10,619 | 49,982 |
Accumulated Amortization | (9,304) | (46,285) |
Net Carrying Amount | 1,315 | 3,697 |
Aerospace [Member] |  |  |
Gross Carrying Value | 367,930 | 406,294 |
Accumulated Amortization | (137,465) | (147,989) |
Net Carrying Amount | 230,465 | 258,305 |
Aerospace [Member] | Process Technology [Member] |  |  |
Gross Carrying Value | 76,605 | 76,718 |
Accumulated Amortization | (31,719) | (26,129) |
Net Carrying Amount | 44,886 | 50,589 |
Aerospace [Member] | Customer Relationships [Member] |  |  |
Gross Carrying Value | 282,225 | 282,225 |
Accumulated Amortization | (97,281) | (77,288) |
Net Carrying Amount | 184,944 | 204,937 |
Aerospace [Member] | Intellectual Property [Member] |  |  |
Gross Carrying Value | 0 | 0 |
Accumulated Amortization | 0 | 0 |
Net Carrying Amount | 0 | 0 |
Aerospace [Member] | Other Intangibles [Member] |  |  |
Gross Carrying Value | 9,100 | 47,351 |
Accumulated Amortization | (8,465) | (44,572) |
Net Carrying Amount | 635 | 2,779 |
Energy [Member] |  |  |
Gross Carrying Value | 86,257 | 88,315 |
Accumulated Amortization | (61,950) | (57,845) |
Net Carrying Amount | 24,307 | 30,470 |
Energy [Member] | Process Technology [Member] |  |  |
Gross Carrying Value | 23,078 | 23,458 |
Accumulated Amortization | (13,141) | (11,699) |
Net Carrying Amount | 9,937 | 11,759 |
Energy [Member] | Customer Relationships [Member] |  |  |
Gross Carrying Value | 41,706 | 42,008 |
Accumulated Amortization | (32,032) | (29,711) |
Net Carrying Amount | 9,674 | 12,297 |
Energy [Member] | Intellectual Property [Member] |  |  |
Gross Carrying Value | 19,954 | 20,218 |
Accumulated Amortization | (15,938) | (14,722) |
Net Carrying Amount | 4,016 | 5,496 |
Energy [Member] | Other Intangibles [Member] |  |  |
Gross Carrying Value | 1,519 | 2,631 |
Accumulated Amortization | (839) | (1,713) |
Net Carrying Amount | $ 680 | $ 918 |

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 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=26713463&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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