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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | --- | --- | ---
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | $ 185,069 | $ 97,540 |  |
Unbilled | 74,456 | 19,100 |  |
Customers' credit balances and deposits | (24,878) | (44,910) | $ (25,521) | $ (33,246)
Customers accounts receivables & Customers' credit balances and deposits | 234,647 | 71,730 |  |
Operating Segments | NJNG |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 142,088 | 55,234 |  |
Unbilled | 69,904 | 10,784 |  |
Customers' credit balances and deposits | (24,860) | (44,898) |  |
Customers accounts receivables & Customers' credit balances and deposits | 187,132 | 21,120 |  |
Operating Segments | CEV |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 7,273 | 9,962 |  |
Unbilled | 4,552 | 8,316 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 11,825 | 18,278 |  |
Operating Segments | ES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 25,241 | 23,716 |  |
Unbilled | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 25,241 | 23,716 |  |
Operating Segments | S&T |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 7,749 | 6,577 |  |
Unbilled | 0 | 0 |  |
Customers' credit balances and deposits | (18) | (12) |  |
Customers accounts receivables & Customers' credit balances and deposits | 7,731 | 6,565 |  |
Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Billed | 2,718 | 2,051 |  |
Unbilled | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | $ 2,718 | $ 2,051 |  |

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