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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |
Operating revenues | $ 675,842 | $ 454,305 |
Loans receivable in other noncurrent assets | 32,600 |  | $ 32,300
Proceeds from sale leaseback transaction | 17,300 | 0 |
Proceeds from sale leaseback transaction - solar | 3,300 | 12,124 |
Financial Asset, Not Past Due |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Loans receivable in other current assets | 14,100 |  | $ 14,200
Energy Services |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Operating revenues | 22,100 |  |
Deferred revenue | 64,700 |  |
Natural Gas Distribution |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Proceeds from sale leaseback transaction | $ 17,300 | $ 0 |
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Loans receivable, term | 2 years |  |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Loans receivable, term | 10 years |  |

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