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REVENUE - DISAGGREGATED REVENUE - PRODUCT (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
Alternative revenue programs | 1,087 | 27,257 | 11,259
Derivative instruments | 560,628 | 834,387 | 1,695,829
Revenues out of scope | 566,590 | 851,474 | 1,706,994
Total operating revenues | 1,796,539 | 1,962,994 | 2,905,979
Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 861,882 | 845,392 | 951,626
Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 260,374 | 169,834 | 151,536
Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 36,231 | 35,210 | 33,932
Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 26,404 | 22,428 | 22,250
Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 15,111 | 12,636 | 5,487
Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 32,913 | 31,733 | 38,317
ES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenues | 137,200 | 48,500 |
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenues | 1,734,162 | 1,905,561 | 2,850,161
Operating Segments | NJNG |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 860,532 | 844,043 | 950,276
Alternative revenue programs | 1,087 | 27,257 | 11,259
Derivative instruments | 156,863 | 139,984 | 165,882
Revenues out of scope | 157,950 | 167,241 | 177,141
Total operating revenues | 1,018,482 | 1,011,284 | 1,127,417
Operating Segments | NJNG | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 861,882 | 845,392 | 951,626
Operating Segments | NJNG | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | NJNG | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | NJNG | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | NJNG | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | NJNG | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | CEV |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 48,024 | 44,369 | 43,804
Alternative revenue programs | 0 | 0 | 0
Derivative instruments | 82,539 | 79,762 | 84,476
Revenues out of scope | 82,539 | 79,762 | 84,476
Total operating revenues | 130,563 | 124,131 | 128,280
Operating Segments | CEV | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | CEV | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | CEV | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | CEV | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | CEV | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 15,111 | 12,636 | 5,487
Operating Segments | CEV | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 32,913 | 31,733 | 38,317
Operating Segments | ES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 164,165 | 76,975 | 83,801
Alternative revenue programs | 0 | 0 | 0
Derivative instruments | 321,226 | 614,641 | 1,445,471
Revenues out of scope | 326,101 | 604,471 | 1,445,377
Total operating revenues | 490,266 | 681,446 | 1,529,178
Operating Segments | ES | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | ES | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 164,165 | 76,975 | 83,801
Operating Segments | ES | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | ES | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | ES | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | ES | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | S&T |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 94,851 | 88,700 | 65,286
Alternative revenue programs | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0
Total operating revenues | 94,851 | 88,700 | 65,286
Operating Segments | S&T | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | S&T | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 96,209 | 92,859 | 67,735
Operating Segments | S&T | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | S&T | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | S&T | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | S&T | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
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 | HSO |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 62,377 | 57,433 | 55,818
Alternative revenue programs | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0
Total operating revenues | 62,377 | 57,433 | 55,818
Corporate, Non-Segment | HSO | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Corporate, Non-Segment | HSO | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Corporate, Non-Segment | HSO | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 36,231 | 35,210 | 33,932
Corporate, Non-Segment | HSO | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 26,404 | 22,428 | 22,250
Corporate, Non-Segment | HSO | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Corporate, Non-Segment | HSO | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | (2,966) | (5,713) | (4,163)
Revenues out of scope | 4,875 | (10,170) | (94)
Total operating revenues |  | (15,883) | (4,257)
Eliminations | NJNG |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | (1,350) | (1,349) | (1,350)
Revenues out of scope | 0 | 0 | 0
Eliminations | CEV |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0
Eliminations | ES |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Revenues out of scope | 4,875 | (10,170) | (94)
Eliminations | S&T |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | (1,358) | (4,159) | (2,449)
Revenues out of scope | 0 | 0 | 0
Eliminations | HSO |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | (258) | (205) | (364)
Revenues out of scope | $ 0 | $ 0 | $ 0

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