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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | $ 1,229,949 | $ 1,111,520 | $ 1,198,985
Revenues out of scope | 566,590 | 851,474 | 1,706,994
Total operating revenues | 1,796,539 | 1,962,994 | 2,905,979
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 717,785 | 692,422 | 654,886
Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 416,965 | 332,729 | 446,471
Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 86,600 | 77,722 | 92,531
Interruptible, off-tariff and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 8,599 | 8,647 | 5,097
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenues | 1,734,162 | 1,905,561 | 2,850,161
Corporate, Non-Segment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues out of scope | 0 | 0 | 0
Total operating revenues | 62,377 | 57,433 | 55,818
Corporate, Non-Segment | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 62,219 | 57,091 | 55,629
Corporate, Non-Segment | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 158 | 342 | 189
Corporate, Non-Segment | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Corporate, Non-Segment | Interruptible, off-tariff and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
NJNG | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 860,532 | 844,043 | 950,276
Revenues out of scope | 157,950 | 167,241 | 177,141
Total operating revenues | 1,018,482 | 1,011,284 | 1,127,417
NJNG | Operating Segments | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 641,606 | 621,663 | 586,678
NJNG | Operating Segments | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 123,727 | 136,011 | 265,970
NJNG | Operating Segments | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 86,600 | 77,722 | 92,531
NJNG | Operating Segments | Interruptible, off-tariff and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 8,599 | 8,647 | 5,097
CEV | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 48,024 | 44,369 | 43,804
Revenues out of scope | 82,539 | 79,762 | 84,476
Total operating revenues | 130,563 | 124,131 | 128,280
CEV | Operating Segments | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 13,960 | 13,668 | 12,579
CEV | Operating Segments | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 34,064 | 30,701 | 31,225
CEV | Operating Segments | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
CEV | Operating Segments | Interruptible, off-tariff and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
ES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenues | 137,200 | 48,500 |
ES | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 164,165 | 76,975 | 83,801
Revenues out of scope | 326,101 | 604,471 | 1,445,377
Total operating revenues | 490,266 | 681,446 | 1,529,178
ES | Operating Segments | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
ES | Operating Segments | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 164,165 | 76,975 | 83,801
ES | Operating Segments | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
ES | Operating Segments | Interruptible, off-tariff and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
S&T | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 94,851 | 88,700 | 65,286
Revenues out of scope | 0 | 0 | 0
Total operating revenues | 94,851 | 88,700 | 65,286
S&T | Operating Segments | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
S&T | Operating Segments | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 94,851 | 88,700 | 65,286
S&T | Operating Segments | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
S&T | Operating Segments | Interruptible, off-tariff and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | $ 0 | $ 0 | $ 0

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