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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Operating revenues | $ 912,316 | $ 802,187 | $ 1,588,158 | $ 1,256,492 |
Loans receivable in other noncurrent assets | 33,700 |  | 33,700 |  | $ 32,300
Proceeds from sale leaseback transactions |  |  | 17,300 | 0 |
Proceeds from sale leaseback transactions - solar |  |  | 3,300 | 12,124 |
Financial Asset, Not Past Due |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Loans receivable in other current assets | 14,500 |  | 14,500 |  | $ 14,200
Energy Services |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Operating revenues | 10,300 |  | 32,400 |  |
Deferred revenue | $ 54,400 |  | 54,400 |  |
Natural Gas Distribution |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Proceeds from sale leaseback transactions |  |  | $ 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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