Stock Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended												12 Months Ended						0 Months Ended				0 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Chief Financial Officer Common shares reserved under stock option plans	Sep. 30, 2013 Prior to October 1 2005	Sep. 30, 2013 After October 1 2005	Sep. 30, 2013 Minimum	Sep. 30, 2013 Maximum	Sep. 30, 2013 Restricted Stock Units (RSUs)	Sep. 30, 2012 Restricted Stock Units (RSUs)	Sep. 30, 2011 Restricted Stock Units (RSUs)	Sep. 30, 2010 Restricted Stock Units (RSUs)	Sep. 30, 2013 Restricted Stock Units (RSUs) Minimum	Sep. 30, 2013 Restricted Stock Units (RSUs) Maximum	Sep. 30, 2013 Employee Stock	Sep. 30, 2013 Options and Restricted Stock Units [Member]	Sep. 30, 2012 Options and Restricted Stock Units [Member]	Sep. 30, 2011 Options and Restricted Stock Units [Member]	Feb. 08, 2013 2007 Incentive Compensation Plan	Jul. 20, 2011 2007 Incentive Compensation Plan	Jul. 30, 2007 2007 Incentive Compensation Plan	Jul. 20, 2011 2007 Incentive Compensation Plan Restricted Stock Units (RSUs)	Sep. 17, 2012 2012 Inducement Option Plan Chingis	Sep. 30, 2013 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)	5,621,000								269,000	323,000	382,000	69,000
Shares available for future grant under the 2007 Plan (shares)	2,255,000								35,000
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)	581,000																				3,000,000	263,100
Additional shares available for issuance																			2,000,000	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
Portion vested of total shares																							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)	237,000	181,000	167,000
Total unrecognized stock-based compensation expense	$ 10.4														$ 0.2
Nonvested awards, total compensation cost not yet recognized, period for recognition (years)	2 years 5 months 19 days														4 months
Total intrinsic value of options exercised and RSU's vested																$ 7.0	$ 5.7	$ 3.5
Weighted average grant date fair value (in dollars per share)									$ 9.14	$ 9.42	$ 7.82