Goodwill and other Identifiable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 80,136	$ 80,136	$ 79,629
Accumulated amortization	(70,408)	(70,408)	(69,000)
Net	9,728	9,728	10,629
Intangible impairment charge	361	361	0	0
Purchased and Core Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	45,960	45,960	46,597
Accumulated amortization	(44,306)	(44,306)	(43,639)
Net	1,654	1,654	2,958
Intangible impairment charge	200
License Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,440	2,440	2,840
Accumulated amortization	(2,440)	(2,440)	(2,682)
Net	0	0	158
Intangible impairment charge	100
Patents and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	11,322	11,322	10,943
Accumulated amortization	(9,000)	(9,000)	(8,469)
Net	2,322	2,322	2,474
Intangible impairment charge	100
Customer Maintenance Contracts
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	0	0	700
Accumulated amortization	0	0	(700)
Net	0	0	0
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	18,954	18,954	17,504
Accumulated amortization	(14,130)	(14,130)	(12,465)
Net	4,824	4,824	5,039
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,100	1,100	1,045
Accumulated amortization	(202)	(202)	(1,045)
Net	898	898	0
Order Backlog
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	360	360	0
Accumulated amortization	(330)	(330)	0
Net	$ 30	$ 30	$ 0