Purchased Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Net	$ 7,033
Gross	9,120	9,120
Accumulated Amortization	1,687	894
Total, Net	7,433	8,226	[1]
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	4,930	4,930
Accumulated Amortization	1,304	879
Net	3,626	4,051
In-process technology (IPR&D)
Finite-Lived Intangible Assets [Line Items]
Gross	400	400
Accumulated Amortization	0	0
Net	400	400
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	3,340	3,340
Accumulated Amortization	302	9
Net	3,038	3,331
Other
Finite-Lived Intangible Assets [Line Items]
Gross	450	450
Accumulated Amortization	81	6
Net	$ 369	$ 444

[1] Derived from audited financial statements.