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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | --- | --- | ---
Customer accounts receivable |  |  |  |
Billed | $ 273,313 | $ 212,838 | $ 237,229 | $ 134,173
Unbilled revenues | 56,270 | 10,351 | 41,941 | 9,226
Customers' credit balances and deposits | (20,284) | (32,586) | $ (20,763) | $ (25,934)
Customers accounts receivables & Customers' credit balances and deposits | 309,299 | 190,603 |  |
Operating Segments | Natural Gas Distribution |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 154,380 | 54,514 |  |
Unbilled revenues | 54,675 | 8,427 |  |
Customers' credit balances and deposits | (20,284) | (32,586) |  |
Customers accounts receivables & Customers' credit balances and deposits | 188,771 | 30,355 |  |
Operating Segments | Clean Energy Ventures |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 5,239 | 5,534 |  |
Unbilled revenues | 1,595 | 1,924 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 6,834 | 7,458 |  |
Operating Segments | Energy Services |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 107,262 | 147,087 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 107,262 | 147,087 |  |
Operating Segments | Storage and Transportation |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 4,385 | 3,956 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 4,385 | 3,956 |  |
Home Services and Other |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 2,047 | 1,747 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | $ 2,047 | $ 1,747 |  |

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