Income Taxes (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Operating Loss Carryforwards [Line Items]
Federal statutory rate		35.00%
Income tax benefit from release of valuation allowance for certain deferred tax assets	$ 28,100,000	$ 1,384,000	$ (28,136,000)	$ 0
Stock Options
Operating Loss Carryforwards [Line Items]
Valuation allowance		13,100,000
Expectations of Future Taxable Income
Operating Loss Carryforwards [Line Items]
Income tax benefit from release of valuation allowance for certain deferred tax assets		2,700,000	40,500,000	16,100,000
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		56,800,000
Research and development tax credit carryforwards		3,400,000
Minimum tax credit carryforwards		600,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		80,700,000
Research and development tax credit carryforwards		2,600,000
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		14,500,000
Research and development tax credit carryforwards		3,600,000
Foreign tax credit carryforwards		1,300,000
Tax benefit from tax holiday		$ 0	$ 57,000	$ 307,000