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EQUITY BASED COMPENSATION (Details Textuals) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Nov. 07, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Dec. 01, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense recognized for share based payments   $ 10.0 $ 8.0 $ 5.0  
Weighted average fair value (per share)   $ 10.01      
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options expiration period   10 years      
Vesting term   3 years      
Options granted   0 0    
Compensation expense recognized for share based payments     $ 1.2    
Stock options exercised   0 0 0  
Weighted-average grant date fair value per share       $ 3.69  
Stock Options | Hiring Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of award       $ 1.3  
Requisite service period       12 months  
Stock Options | Hiring Incentive Plan [Member] | Chief Executive Officer [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted       350,000  
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting term   3 years      
Shares granted in period   500,000 200,000 1,000,000  
Weighted average grant-date fair value non-vested restricted shares and share units granted during period   $ 13.91 $ 9.23 $ 4.43  
Equity instruments other than options outstanding (in shares)   1,400,000.0      
Weighted average fair value (per share)   $ 8.23      
Restricted Stock and Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense recognized for share based payments   $ 4.0 $ 4.0 $ 5.0  
Weighted average grant-date fair value non-vested restricted shares and share units granted during period   $ 13.91      
Equity instruments other than options outstanding (in shares)   1,447,000 2,038,000    
Weighted average fair value (per share)   $ 8.23 $ 7.16    
Total unrecognized compensation costs related to non-vested equity compensation arrangements   $ 6.0      
Weighted average period for compensation cost recognition   2 years      
Granted (in shares)   528,000      
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense recognized for share based payments   $ 8.0 $ 4.0    
Weighted average grant-date fair value non-vested restricted shares and share units granted during period   $ 13.76      
Equity instruments other than options outstanding (in shares)   2,310,000 1,635,000    
Weighted average fair value (per share)   $ 10.01 $ 8.27    
Total unrecognized compensation costs related to non-vested equity compensation arrangements   $ 14.0      
Weighted average period for compensation cost recognition   2 years      
Share price on grant date         $ 7.97
Number of shares available for grant 1,800,000        
Performance period   3 years      
Granted (in shares)   749,000      
Performance Shares | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage 0.00%        
Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage 200.00%        
Performance Shares | Performance Objective One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   50.00%      
Performance Shares | Performance Objective Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   25.00%      
Performance Shares | Performance Objective Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   25.00%