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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Oct. 11, 2019 | Oct. 01, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Loans receivable in other current assets | $ 12,600 |  |  | $ 12,400
Loans receivable in other noncurrent assets | 39,600 |  |  | $ 38,800
Operating lease assets | 87,793 |  |  |
Operating lease, liability | $ 86,714 |  |  |
Leaf River Energy Center LLC |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Operating lease assets |  | $ 21,600 |  |
Operating lease, liability |  | $ 21,600 |  |
Accounting Standards Update 2016-02 |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Operating lease assets |  |  | $ 67,100 |
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Loans receivable, term | 2 years |  |  |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Loans receivable, term | 10 years |  |  |
Other noncurrent assets |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Capitalized software costs | $ 9,100 |  |  |
Operation and maintenance |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Capitalized software costs | $ 1,500 |  |  |

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