Purchased Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Gross	$ 9,120	$ 9,120
Accumulated Amortization	4,374	4,027
Net	4,746
Total, Net	4,746	5,093	[1]
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	5,330	5,330
Accumulated Amortization	2,755	2,584
Net	2,575	2,746
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	3,340	3,340
Accumulated Amortization	1,276	1,137
Net	2,064	2,203
Other
Finite-Lived Intangible Assets [Line Items]
Gross	450	450
Accumulated Amortization	343	306
Net	$ 107	$ 144

[1] Derived from audited financial statements.