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Goodwill and other Identifiable Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | $ 76,874 | $ 80,413 |
Accumulated amortization |  | (72,695) | (73,628) |
Net |  | 4,179 | 6,785 |
Intangible impairment charge | $ 361 | 0 | 0 | $ 361
Purchased and Core Technology |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | 45,449 | 45,952 |
Accumulated amortization |  | (45,424) | (45,162) |
Net |  | 25 | 790 |
Intangible impairment charge | 200 |  |  |
License Agreements |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | 18 | 2,440 |
Accumulated amortization |  | (4) | (2,440) |
Net |  | 14 | 0 |
Intangible impairment charge | 100 |  |  |
Patents and Trademarks |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | 11,817 | 11,667 |
Accumulated amortization |  | (10,568) | (9,799) |
Net |  | 1,249 | 1,868 |
Intangible impairment charge | $ 100 |  |  |
Customer Relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | 18,490 | 18,894 |
Accumulated amortization |  | (16,057) | (15,445) |
Net |  | 2,433 | 3,449 |
Non-compete Agreements |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | 1,100 | 1,100 |
Accumulated amortization |  | (642) | (422) |
Net |  | 458 | 678 |
Order Backlog |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | 0 | 360 |
Accumulated amortization |  | 0 | (360) |
Net |  | $ 0 | $ 0 |

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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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