Goodwill and other Identifiable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 80,136	$ 80,413	$ 80,136
Accumulated amortization	(70,408)	(73,628)	(70,408)
Net	9,728	6,785	9,728
Intangible impairment charge	361	0	361	0
Purchased and Core Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	45,960	45,952	45,960
Accumulated amortization	(44,306)	(45,162)	(44,306)
Net	1,654	790	1,654
Intangible impairment charge	200
License Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,440	2,440	2,440
Accumulated amortization	(2,440)	(2,440)	(2,440)
Net	0	0	0
Intangible impairment charge	100
Patents and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	11,322	11,667	11,322
Accumulated amortization	(9,000)	(9,799)	(9,000)
Net	2,322	1,868	2,322
Intangible impairment charge	100
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	18,954	18,894	18,954
Accumulated amortization	(14,130)	(15,445)	(14,130)
Net	4,824	3,449	4,824
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,100	1,100	1,100
Accumulated amortization	(202)	(422)	(202)
Net	898	678	898
Order Backlog
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	360	360	360
Accumulated amortization	(330)	(360)	(330)
Net	$ 30	$ 0	$ 30

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=26713463&loc=d3e16323-109275

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

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