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Intangible Assets, Net (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Gross Carrying Value | $ 442,443 |  | $ 443,445
Accumulated Amortization | (251,510) |  | (245,795)
Net Carrying Amount | 190,933 |  | 197,650
Amortization expense | 6,458 | $ 6,946 |
Process Technology [Member] |  |  |
Gross Carrying Value | 99,201 |  | 99,570
Accumulated Amortization | (61,047) |  | (59,429)
Net Carrying Amount | 38,154 |  | 40,141
Customer Relationships [Member] |  |  |
Gross Carrying Value | 322,918 |  | 323,194
Accumulated Amortization | (171,938) |  | (167,667)
Net Carrying Amount | 150,980 |  | 155,527
Intellectual Property [Member] |  |  |
Gross Carrying Value | 19,156 |  | 19,435
Accumulated Amortization | (17,734) |  | (17,876)
Net Carrying Amount | 1,422 |  | 1,559
Other Intangibles [Member] |  |  |
Gross Carrying Value | 1,168 |  | 1,246
Accumulated Amortization | (791) |  | (823)
Net Carrying Amount | 377 |  | 423
Aerospace [Member] |  |  |
Gross Carrying Value | 358,830 |  | 358,830
Accumulated Amortization | (183,111) |  | (177,387)
Net Carrying Amount | 175,719 |  | 181,443
Aerospace [Member] | Process Technology [Member] |  |  |
Gross Carrying Value | 76,605 |  | 76,605
Accumulated Amortization | (44,703) |  | (43,229)
Net Carrying Amount | 31,902 |  | 33,376
Aerospace [Member] | Customer Relationships [Member] |  |  |
Gross Carrying Value | 282,225 |  | 282,225
Accumulated Amortization | (138,408) |  | (134,158)
Net Carrying Amount | 143,817 |  | 148,067
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 |  | 0
Accumulated Amortization | 0 |  | 0
Net Carrying Amount | 0 |  | 0
Industrial [Member] |  |  |
Gross Carrying Value | 83,613 |  | 84,615
Accumulated Amortization | (68,399) |  | (68,408)
Net Carrying Amount | 15,214 |  | 16,207
Industrial [Member] | Process Technology [Member] |  |  |
Gross Carrying Value | 22,596 |  | 22,965
Accumulated Amortization | (16,344) |  | (16,200)
Net Carrying Amount | 6,252 |  | 6,765
Industrial [Member] | Customer Relationships [Member] |  |  |
Gross Carrying Value | 40,693 |  | 40,969
Accumulated Amortization | (33,530) |  | (33,509)
Net Carrying Amount | 7,163 |  | 7,460
Industrial [Member] | Intellectual Property [Member] |  |  |
Gross Carrying Value | 19,156 |  | 19,435
Accumulated Amortization | (17,734) |  | (17,876)
Net Carrying Amount | 1,422 |  | 1,559
Industrial [Member] | Other Intangibles [Member] |  |  |
Gross Carrying Value | 1,168 |  | 1,246
Accumulated Amortization | (791) |  | (823)
Net Carrying Amount | $ 377 |  | $ 423

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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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