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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | --- | --- | ---
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | $ 110,463 | $ 222,297 |  |
Unbilled revenues | 16,492 | 13,769 |  |
Customers' credit balances and deposits | (30,267) | (33,246) | $ (22,216) | $ (32,586)
Customers accounts receivables & Customers' credit balances and deposits | 96,688 | 202,820 |  |
Operating Segments | Natural Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 72,747 | 78,508 |  |
Unbilled revenues | 10,583 | 10,814 |  |
Customers' credit balances and deposits | (30,259) | (33,246) |  |
Customers accounts receivables & Customers' credit balances and deposits | 53,071 | 56,076 |  |
Operating Segments | Clean Energy Ventures |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 7,433 | 5,566 |  |
Unbilled revenues | 5,909 | 2,955 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 13,342 | 8,521 |  |
Operating Segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 20,675 | 129,199 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 20,675 | 129,199 |  |
Operating Segments | Storage and Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 7,485 | 7,012 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | (8) | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 7,477 | 7,012 |  |
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 2,123 | 2,012 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | $ 2,123 | $ 2,012 |  |

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