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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]      
Customer accounts receivable $ 222,297 $ 212,838  
Customers’ credit balances and deposits (33,246) (32,586) $ (25,934)
Customers accounts receivables & Customers' credit balances and deposits 202,820 190,603  
Billed      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 222,297 212,838 134,173
Unbilled revenues      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 13,769 10,351 $ 9,226
Operating Segments | Natural Gas Distribution      
Disaggregation of Revenue [Line Items]      
Customers’ credit balances and deposits (33,246) (32,586)  
Customers accounts receivables & Customers' credit balances and deposits 56,076 30,355  
Operating Segments | Natural Gas Distribution | Billed      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 78,508 54,514  
Operating Segments | Natural Gas Distribution | Unbilled revenues      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 10,814 8,427  
Operating Segments | Clean Energy Ventures      
Disaggregation of Revenue [Line Items]      
Customers’ credit balances and deposits 0 0  
Customers accounts receivables & Customers' credit balances and deposits 8,521 7,458  
Operating Segments | Clean Energy Ventures | Billed      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 5,566 5,534  
Operating Segments | Clean Energy Ventures | Unbilled revenues      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 2,955 1,924  
Operating Segments | Energy Services      
Disaggregation of Revenue [Line Items]      
Customers’ credit balances and deposits 0 0  
Customers accounts receivables & Customers' credit balances and deposits 129,199 147,087  
Operating Segments | Energy Services | Billed      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 129,199 147,087  
Operating Segments | Energy Services | Unbilled revenues      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 0 0  
Operating Segments | Storage and Transportation      
Disaggregation of Revenue [Line Items]      
Customers’ credit balances and deposits 0 0  
Customers accounts receivables & Customers' credit balances and deposits 7,012 3,956  
Operating Segments | Storage and Transportation | Billed      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 7,012 3,956  
Operating Segments | Storage and Transportation | Unbilled revenues      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 0 0  
Home Services and Other      
Disaggregation of Revenue [Line Items]      
Customers’ credit balances and deposits 0 0  
Customers accounts receivables & Customers' credit balances and deposits 2,012 1,747  
Home Services and Other | Billed      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable 2,012 1,747  
Home Services and Other | Unbilled revenues      
Disaggregation of Revenue [Line Items]      
Customer accounts receivable $ 0 $ 0