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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended
May 26, 2021
Dec. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
May 26, 2021
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]                  
Payment to acquire building $ 41,100,000                
Reserve for expected credit losses             $ 15,288,000 $ 1,657,000  
Loans receivable in other current assets     $ 14,300,000       14,300,000   $ 13,700,000
Loans receivable in other noncurrent assets     33,200,000       33,200,000   $ 35,300,000
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                  
Finite-Lived Intangible Assets [Line Items]                  
Reserve for expected credit losses         $ 5,200,000        
Natural Gas Distribution                  
Finite-Lived Intangible Assets [Line Items]                  
Sale leaseback transaction, lease term           16 years      
Proceeds from sale leaseback transaction   $ 4,000,000.0         $ 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