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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