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DEBT - LONG TERM DEBT (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from sale leaseback transaction |  |  |  | $ 0 | $ 4,000,000
Proceeds from sale leaseback transaction - solar |  | $ 5,500,000 | $ 42,900,000 | $ 17,673,000 | 42,927,000
Clean Energy Ventures | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Sale leaseback transaction lease term |  |  |  | 5 years |
Clean Energy Ventures | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Sale leaseback transaction lease term |  |  |  | 15 years |
NJNG |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from sale leaseback transaction | $ 4,000,000.0 |  |  | $ 0 |
Final principal payments for early purchase options |  |  |  | $ 1,200,000 | $ 1,200,000

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- Definition Sale Leaseback Transaction, Final Principal Payments + References No definition available. + Details
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