Purchased Intangible Assets (Schedule of Current Finite-Lived Intangible Asset Amortization Expense by Income Statement Line Item) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Schedule of Current Intangible Asset Amortization Expense By Income Statement Line Item [Line Items]
Amortization expense of intangible assets	$ 1,848	$ 1,698	$ 1,019
Cost of sales
Schedule of Current Intangible Asset Amortization Expense By Income Statement Line Item [Line Items]
Amortization expense of intangible assets	984	1,082	944
Operating expenses
Schedule of Current Intangible Asset Amortization Expense By Income Statement Line Item [Line Items]
Amortization expense of intangible assets	$ 864	$ 616	$ 75