Purchased Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Gross	$ 9,120	$ 9,120
Accumulated Amortization	2,903	2,494
Net	6,217
Total, Net	6,217	6,626	[1]
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	5,330	5,330
Accumulated Amortization	1,990	1,758
Net	3,340	3,572
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	3,340	3,340
Accumulated Amortization	719	580
Net	2,621	2,760
Other
Finite-Lived Intangible Assets [Line Items]
Gross	450	450
Accumulated Amortization	194	156
Net	$ 256	$ 294

[1] Derived from audited financial statements.