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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | --- | --- | ---
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | $ 194,453 | $ 222,297 |  |
Customers' credit balances and deposits | (25,521) | (33,246) | $ (20,284) | $ (32,586)
Customers accounts receivables & Customers' credit balances and deposits | 214,972 | 202,820 |  |
Billed |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 194,453 | 222,297 | 273,313 | 212,838
Unbilled |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 46,040 | 13,769 | $ 56,270 | $ 10,351
Operating Segments | Natural Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customers' credit balances and deposits | (25,516) | (33,246) |  |
Customers accounts receivables & Customers' credit balances and deposits | 159,779 | 56,076 |  |
Operating Segments | Natural Gas Distribution | Billed |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 142,275 | 78,508 |  |
Operating Segments | Natural Gas Distribution | Unbilled |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 43,020 | 10,814 |  |
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 | 8,937 | 8,521 |  |
Operating Segments | Clean Energy Ventures | Billed |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 5,917 | 5,566 |  |
Operating Segments | Clean Energy Ventures | Unbilled |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 3,020 | 2,955 |  |
Operating Segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 37,280 | 129,199 |  |
Operating Segments | Energy Services | Billed |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 37,280 | 129,199 |  |
Operating Segments | Energy Services | Unbilled |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 0 | 0 |  |
Operating Segments | Storage and Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customers' credit balances and deposits | (5) | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 7,085 | 7,012 |  |
Operating Segments | Storage and Transportation | Billed |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 7,090 | 7,012 |  |
Operating Segments | Storage and Transportation | Unbilled |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 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 | 1,891 | 2,012 |  |
Home Services and Other | Billed |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 1,891 | 2,012 |  |
Home Services and Other | Unbilled |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | $ 0 | $ 0 |  |

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