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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - RECEIVABLE BY SUBSIDIARY (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Establishment of allowance for doubtful accounts, customer account balances, days outstanding (more than) 60 days  
Billed $ 205,490 $ 196,467
Receivable by subsidiary percentage 100.00% 100.00%
Unbilled revenues $ 7,199 $ 7,202
Energy Services    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 157,936 $ 150,322
Receivable by subsidiary percentage 77.00% 77.00%
Natural Gas Distribution    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed [1] $ 39,151 $ 37,432
Receivable by subsidiary percentage [1] 19.00% 19.00%
Clean Energy Ventures    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 3,330 $ 2,655
Receivable by subsidiary percentage 2.00% 1.00%
Home Services and Other Operations    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed $ 5,073 $ 6,058
Receivable by subsidiary percentage 2.00% 3.00%
[1] Does not include unbilled revenues of $7.2 million as of September 30, 2018 and 2017.