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STOCK BASED COMPENSATION Summary of restricted stock unit activity (Details) (Restricted Stock Units (RSUs), USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 3.2 $ 3.3 $ 2.9  
Impact of retaining common stock from employees upon vesting of restricted shares and restricted stock units to cover income tax withholding $ 1.3 $ 0.6 $ 0.6  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]        
Restricted stock units, Restricted Stock Units, Beginning balance 2,021 1,686 1,296  
Restricted stock units, Weighted Average Grant-Date Fair Value per Share, Beginning balance $ 2.65 $ 3.49 $ 4.66  
Restricted stock units, Weighted average remaining contractual life (in years), Beginning balance 11 months 15 days 1 year 1 month 17 days 1 year 1 month 2 days 1 year 4 months 17 days
Aggregate intrinsic value, Beginning balance, Restricted stock $ 6,143,000 $ 4,113,000 $ 3,823,000  
Restricted Stock Units, Awarded 1,600 1,527 1,258  
Weighted Average Grant-Date Fair Value per Share, Awarded $ 2.62 $ 2.12 $ 2.57  
Restricted Stock Units, Released (1,183) (1,045) (721)  
Weighted Average Grant-Date Fair Value per Share, Released $ 2.69 $ 3.19 $ 3.99  
Restricted Stock Units, Forfeited (110) (147) (147)  
Weighted Average Grant-Date Fair Value per Share, Forfeited $ 2.60 $ 2.88 $ 3.48  
Restricted stock units, Restricted Stock Units, Ending balance 2,328 2,021 1,686 1,296
Restricted stock units, Weighted Average Grant-Date Fair Value per Share, Ending balance $ 2.61 $ 2.65 $ 3.49 $ 4.66
Restricted stock units, Weighted average remaining contractual life (in years), Ending balance 11 months 15 days 1 year 1 month 17 days 1 year 1 month 2 days 1 year 4 months 17 days
Aggregate intrinsic value, Ending balance, Restricted stock $ 8,380,000 $ 6,143,000 $ 4,113,000 $ 3,823,000
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Non-employee Director
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage after one year 33.3333%      
Vesting percentage after two years 33.3333%      
Vesting percentage after three years 33.3333%      
Annual award vesting percentage 100.00%