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INCOME TAXES (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Effective income tax rate 24.30% 28.20%    
Operating Loss Carryforwards [Line Items]        
Forecasted annual ITC for effective tax rate calculation       $ 17,900
Forecasted annual PTC for effective tax rate calculation       $ 187
ITC carryforward, expiration period       20 years
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards $ 191,000     $ 153,200
Net operating loss carryforwards, expiration term 20 years      
Deferred tax assets, operating loss carryforwards $ 11,200     9,000
Valuation allowance $ 200     212
Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards [Line Items]        
ITC carryforward       $ 7,500
Forecast [Member]        
Operating Loss Carryforwards [Line Items]        
Forecasted annual ITC for effective tax rate calculation     $ 22,800  
Forecasted annual PTC for effective tax rate calculation     $ 2,100