Stock Based Compensation (Narrative) (Details) (USD $)	12 Months Ended												12 Months Ended			0 Months Ended	12 Months Ended			12 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2012 Chief Financial Officer Employee Stock Option	Sep. 30, 2012 Prior to October 1 2005	Sep. 30, 2012 After October 1 2005	Sep. 30, 2012 Minimum	Sep. 30, 2012 Maximum	Sep. 30, 2012 Restricted Stock Units (RSUs)	Sep. 30, 2011 Restricted Stock Units (RSUs)	Sep. 30, 2010 Restricted Stock Units (RSUs)	Sep. 30, 2009 Restricted Stock Units (RSUs)	Sep. 30, 2012 Restricted Stock Units (RSUs) Minimum	Sep. 30, 2012 Restricted Stock Units (RSUs) Maximum	Sep. 30, 2012 Employee Stock	Jul. 20, 2011 2007 Incentive Compensation Plan	Sep. 30, 2012 2007 Incentive Compensation Plan	Jun. 30, 2007 2007 Incentive Compensation Plan	Jul. 20, 2011 2007 Incentive Compensation Plan Restricted Stock Units (RSUs)	Sep. 30, 2012 2012 Inducement Option Plan Chingis	Sep. 17, 2012 2012 Inducement Option Plan Chingis	Sep. 30, 2012 1995 Director Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total number of shares subject to options and awards outstanding (shares)	5,800,000								323,000	382,000	69,000	66,000
Shares available for future grant under the 2007 Plan (shares)	1,407,000								157,000
Option vesting period (years)	4 years																					12 months
Option cliff vesting period							6 months	1 year
Options expiration period for grants (years)				7 years	10 years	7 years
Restricted Stock Units vesting period (years)													2 years	4 years
Shares available for future issuance (shares)	818,000																	3,000,000	263,100
Additional shares available for issuance																2,000,000	4,000,000
Granted (shares)																				439,500
Options exercise price (in dollars per share)																					$ 10.42
Vesting percentage																				12.50%
Option vesting term (years)	4 years			6 months																6 months
Portion vested of total shares				48																48
Percentage discount from fair market value for shares purchased under the Employee Stock Purchase Plan	85.00%
Number of new options issued (in shares)	181,000	167,000	116,000
Option to purchase common stock, Number of shares				100,000
Exercise price (in dollars per share)				$ 6.33
Total unrecognized stock-based compensation expense	$ 9,900,000														$ 200,000
Nonvested awards, total compensation cost not yet recognized, period for recognition (years)	2 years 6 months 29 days														4 months
Total intrinsic value of options exercised and RSU's vested									$ 5,742,000	$ 3,498,000	$ 5,318,000
Wieghted average grant date fair value (in dollars per share)									$ 9.42	$ 7.82	$ 8.31