Goodwill and Other Identifiable Intangible Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 75,545	$ 75,694
Accumulated amortization	(71,246)	(71,653)
Net	4,299	4,041
Purchased and Core Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	46,558	46,594
Accumulated amortization	(44,756)	(44,999)
Net	1,802	1,595
License Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	18	18
Accumulated amortization	(12)	(10)
Net	6	8
Patents and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	11,537	11,619
Accumulated amortization	(10,846)	(10,871)
Net	691	748
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	17,432	17,463
Accumulated amortization	(15,632)	(15,773)
Net	$ 1,800	$ 1,690

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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=66006027&loc=d3e16323-109275

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