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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Gross Carrying Value | $ 445,256 | $ 454,187 |
Accumulated Amortization | (220,118) | (199,415) |
Net Carrying Amount | 225,138 | 254,772 |
Amortization expense | 29,241 | 33,580 | $ 36,979
Process Technology [Member] |  |  |
Gross Carrying Value | 99,529 | 99,683 |
Accumulated Amortization | (52,032) | (44,860) |
Net Carrying Amount | 47,497 | 54,823 |
Customer Relationships [Member] |  |  |
Gross Carrying Value | 323,634 | 323,931 |
Accumulated Amortization | (149,123) | (129,313) |
Net Carrying Amount | 174,511 | 194,618 |
Intellectual Property [Member] |  |  |
Gross Carrying Value | 19,445 | 19,954 |
Accumulated Amortization | (16,921) | (15,938) |
Net Carrying Amount | 2,524 | 4,016 |
Other Intangibles [Member] |  |  |
Gross Carrying Value | 2,648 | 10,619 |
Accumulated Amortization | (2,042) | (9,304) |
Net Carrying Amount | 606 | 1,315 |
Aerospace [Member] |  |  |
Gross Carrying Value | 360,230 | 367,930 |
Accumulated Amortization | (154,943) | (137,465) |
Net Carrying Amount | 205,287 | 230,465 |
Aerospace [Member] | Process Technology [Member] |  |  |
Gross Carrying Value | 76,605 | 76,605 |
Accumulated Amortization | (37,411) | (31,719) |
Net Carrying Amount | 39,194 | 44,886 |
Aerospace [Member] | Customer Relationships [Member] |  |  |
Gross Carrying Value | 282,225 | 282,225 |
Accumulated Amortization | (116,232) | (97,281) |
Net Carrying Amount | 165,993 | 184,944 |
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 | 1,400 | 9,100 |
Accumulated Amortization | (1,300) | (8,465) |
Net Carrying Amount | 100 | 635 |
Energy [Member] |  |  |
Gross Carrying Value | 85,026 | 86,257 |
Accumulated Amortization | (65,175) | (61,950) |
Net Carrying Amount | 19,851 | 24,307 |
Energy [Member] | Process Technology [Member] |  |  |
Gross Carrying Value | 22,924 | 23,078 |
Accumulated Amortization | (14,621) | (13,141) |
Net Carrying Amount | 8,303 | 9,937 |
Energy [Member] | Customer Relationships [Member] |  |  |
Gross Carrying Value | 41,409 | 41,706 |
Accumulated Amortization | (32,891) | (32,032) |
Net Carrying Amount | 8,518 | 9,674 |
Energy [Member] | Intellectual Property [Member] |  |  |
Gross Carrying Value | 19,445 | 19,954 |
Accumulated Amortization | (16,921) | (15,938) |
Net Carrying Amount | 2,524 | 4,016 |
Energy [Member] | Other Intangibles [Member] |  |  |
Gross Carrying Value | 1,248 | 1,519 |
Accumulated Amortization | (742) | (839) |
Net Carrying Amount | $ 506 | $ 680 |

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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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: 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=56944662&loc=d3e3602-108585 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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