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Goodwill and Other Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 76,526 | $ 73,934
Accumulated amortization | (71,465) | (71,286)
Net | 5,061 | 2,648
Purchased and Core Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 47,190 | 45,449
Accumulated amortization | (45,345) | (45,424)
Net | 1,845 | 25
License Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 18 | 18
Accumulated amortization | (4) | (4)
Net | 14 | 14
Patents and Trademarks |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 11,491 | 11,377
Accumulated amortization | (10,550) | (10,385)
Net | 941 | 992
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 17,827 | 17,090
Accumulated amortization | (15,566) | (15,473)
Net | $ 2,261 | $ 1,617

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