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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, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Gross Carrying Value | $ 443,445 | $ 445,256 |
Accumulated Amortization | (245,795) | (220,118) |
Net Carrying Amount | 197,650 | 225,138 |
Amortization expense | 27,486 | 29,241 | $ 33,580
Process Technology [Member] |  |  |
Gross Carrying Value | 99,570 | 99,529 |
Accumulated Amortization | (59,429) | (52,032) |
Net Carrying Amount | 40,141 | 47,497 |
Customer Relationships [Member] |  |  |
Gross Carrying Value | 323,194 | 323,634 |
Accumulated Amortization | (167,667) | (149,123) |
Net Carrying Amount | 155,527 | 174,511 |
Intellectual Property [Member] |  |  |
Gross Carrying Value | 19,435 | 19,445 |
Accumulated Amortization | (17,876) | (16,921) |
Net Carrying Amount | 1,559 | 2,524 |
Other Intangibles [Member] |  |  |
Gross Carrying Value | 1,246 | 2,648 |
Accumulated Amortization | (823) | (2,042) |
Net Carrying Amount | 423 | 606 |
Aerospace [Member] |  |  |
Gross Carrying Value | 358,830 | 360,230 |
Accumulated Amortization | (177,387) | (154,943) |
Net Carrying Amount | 181,443 | 205,287 |
Aerospace [Member] | Process Technology [Member] |  |  |
Gross Carrying Value | 76,605 | 76,605 |
Accumulated Amortization | (43,229) | (37,411) |
Net Carrying Amount | 33,376 | 39,194 |
Aerospace [Member] | Customer Relationships [Member] |  |  |
Gross Carrying Value | 282,225 | 282,225 |
Accumulated Amortization | (134,158) | (116,232) |
Net Carrying Amount | 148,067 | 165,993 |
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 | 0 | 1,400 |
Accumulated Amortization | 0 | (1,300) |
Net Carrying Amount | 0 | 100 |
Industrial [Member] |  |  |
Gross Carrying Value | 84,615 | 85,026 |
Accumulated Amortization | (68,408) | (65,175) |
Net Carrying Amount | 16,207 | 19,851 |
Industrial [Member] | Process Technology [Member] |  |  |
Gross Carrying Value | 22,965 | 22,924 |
Accumulated Amortization | (16,200) | (14,621) |
Net Carrying Amount | 6,765 | 8,303 |
Industrial [Member] | Customer Relationships [Member] |  |  |
Gross Carrying Value | 40,969 | 41,409 |
Accumulated Amortization | (33,509) | (32,891) |
Net Carrying Amount | 7,460 | 8,518 |
Industrial [Member] | Intellectual Property [Member] |  |  |
Gross Carrying Value | 19,435 | 19,445 |
Accumulated Amortization | (17,876) | (16,921) |
Net Carrying Amount | 1,559 | 2,524 |
Industrial [Member] | Other Intangibles [Member] |  |  |
Gross Carrying Value | 1,246 | 1,248 |
Accumulated Amortization | (823) | (742) |
Net Carrying Amount | $ 423 | $ 506 |

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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=66902209&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=66006027&loc=d3e16323-109275 + Details
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