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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | --- | ---
Customer accounts receivable |  |  |  |
Billed | $ 266,815 | $ 212,838 | $ 197,641 | $ 134,173
Unbilled revenues | 72,949 | 10,351 | 53,794 | 9,226
Customers' credit balances and deposits | (38,666) | (32,586) | $ (32,948) | $ (25,934)
Customers accounts receivables & Customers' credit balances and deposits | 301,098 | 190,603 |  |
Operating Segments | Natural Gas Distribution |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 102,890 | 54,514 |  |
Unbilled revenues | 71,542 | 8,427 |  |
Customers' credit balances and deposits | (38,666) | (32,586) |  |
Customers accounts receivables & Customers' credit balances and deposits | 135,766 | 30,355 |  |
Operating Segments | Clean Energy Ventures |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 4,608 | 5,534 |  |
Unbilled revenues | 1,407 | 1,924 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 6,015 | 7,458 |  |
Operating Segments | Energy Services |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 153,014 | 147,087 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 153,014 | 147,087 |  |
Operating Segments | Storage and Transportation |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 4,339 | 3,956 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 4,339 | 3,956 |  |
Home Services and Other |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 1,964 | 1,747 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | $ 1,964 | $ 1,747 |  |

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