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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 |

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