Goodwill and Other Identifiable Intangible Assets, Net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 80,641	$ 80,136
Accumulated amortization	(71,591)	(70,408)
Net	9,050	9,728
Purchased and Core Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	46,111	45,960
Accumulated amortization	(44,662)	(44,306)
Net	1,449	1,654
License Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,440	2,440
Accumulated amortization	(2,440)	(2,440)
Net	0	0
Patents and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	11,568	11,322
Accumulated amortization	(9,268)	(9,000)
Net	2,300	2,322
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	19,062	18,954
Accumulated amortization	(14,604)	(14,130)
Net	4,458	4,824
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,100	1,100
Accumulated amortization	(257)	(202)
Net	843	898
Order Backlog
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	360	360
Accumulated amortization	(360)	(330)
Net	$ 0	$ 30