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INCOME TAXES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating Loss Carryforwards [Line Items]            
Forecasted effective tax rate     15.60% 17.70%    
Forecasted tax credits, net of deferred tax           $ 27,100
Excess tax benefits associated with vesting of share-based awards $ 1,500 $ 1,700        
Actual effective tax rate since tax effects of awards are treated as discrete item     14.80% 16.60%    
Deferred tax assets, federal 27,500   $ 27,500     27,500
Deferred tax asset, state 20,200   20,200     18,200
ITC carryforward 111,000   $ 111,000     74,000
ITC carryforward, expiration period     20 years      
Federal            
Operating Loss Carryforwards [Line Items]            
Net operating loss carryforwards 78,700   $ 78,700     78,700
State            
Operating Loss Carryforwards [Line Items]            
Net operating loss carryforwards $ 344,700   $ 344,700     310,600
Valuation allowance           $ 262
Scenario, Forecast            
Operating Loss Carryforwards [Line Items]            
Forecasted tax credits, net of deferred tax         $ 34,600