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Equity (Schedule of Restricted Stock Activity) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Jun. 30, 2013
Sep. 30, 2012
Number of Shares    
Non-vested as of September 30, 2012 (in shares) 957,867  
Restricted Stock Awards
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock awards, vesting period 3 years  
Number of Shares    
Granted (in shares) 0  
Vested (in shares) (106,797)  
Forfeited (in shares) (8,208)  
Non-vested as of September 30, 2012 (in shares) 101,698 216,703
Weighted Average Grant Date Fair Value    
Non-vested as of September 30, 2011 (in dollars per share) $ 5.83  
Granted (in dollars per share) $ 0.00  
Vested (in dollars per share) $ 5.83  
Forfeited (in dollars per share) $ 5.68  
Non-vested as of September 30, 2012 (in dollars per share) $ 5.84  
Restricted Stock Disclosures:    
Remaining unamortized stock-based compensation expense $ 0.3  
Remaining unamortized stock-based compensation expense, period for recognition (in years) 0 years 7 months 6 days  
Restricted Stock Units
   
Number of Shares    
Granted (in shares) 528,300  
Vested (in shares) (177,509)  
Forfeited (in shares) (92,967)  
Non-vested as of September 30, 2012 (in shares) 957,867 700,043
Weighted Average Grant Date Fair Value    
Non-vested as of September 30, 2011 (in dollars per share) $ 4.44  
Granted (in dollars per share) $ 4.63  
Vested (in dollars per share) $ 3.87  
Forfeited (in dollars per share) $ 4.49  
Non-vested as of September 30, 2012 (in dollars per share) $ 4.65  
Restricted Stock Disclosures:    
Remaining unamortized stock-based compensation expense 2.8  
Remaining unamortized stock-based compensation expense, period for recognition (in years) 2 years 0 months 0 days  
Outstanding non-vested RSUs aggregate intrinsic value 3.4  
Outstanding non-vested RSUs weighted average remaining contractual term (in years) 1 year 2 months 12 days  
Share-based compensation arrangement, by share-based payment award, options, vested and expected to vest, exercisable, number 900,000  
Share based compensation arrangement, by share based payment award, equity instruments other than options, expected to vest, intrinsic value $ 3.1  
Share based compensation arrangement, by share based payment award, equity investments other than options, expected to vest, weighted average contractual term (in years) 1 year 2 months 12 days