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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 |

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