Stock Based Compensation (Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 1,283	$ 983	$ 3,730	$ 2,966
Tax effect on stock-based compensation	0	0	0	0
Net effect on net income	1,283	983	3,730	2,966
Cost of sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	35	34	101	130
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	395	255	1,053	796
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 853	$ 694	$ 2,576	$ 2,040