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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 234,836 | $ 209,892 | $ 1,162,987 | $ 964,255
Revenues out of scope | 64,110 | 65,744 | 537,347 | 436,504
Total operating revenues | 298,946 | 275,636 | 1,700,334 | 1,400,759
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 130,985 | 117,031 | 779,537 | 636,580
Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 78,797 | 72,785 | 284,406 | 248,948
Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 22,011 | 17,481 | 91,744 | 72,596
Interruptible, off-tariff and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,043 | 2,595 | 7,300 | 6,131
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 282,799 | 259,337 | 1,653,532 | 1,354,874
Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 16,147 | 16,299 | 46,802 | 45,885
NJNG | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 167,902 | 138,467 | 973,112 | 766,686
Revenues out of scope | 36,888 | 19,306 | 183,446 | 147,043
Total operating revenues | 204,790 | 157,773 | 1,156,558 | 913,729
NJNG | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 114,878 | 97,112 | 730,797 | 580,559
NJNG | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 27,970 | 21,279 | 143,271 | 107,400
NJNG | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 22,011 | 17,481 | 91,744 | 72,596
NJNG | Operating Segments | Interruptible, off-tariff and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,043 | 2,595 | 7,300 | 6,131
CEV | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,851 | 14,447 | 28,406 | 33,036
Revenues out of scope | 179 | 201 | 17,997 | 26,232
Total operating revenues | 12,030 | 14,648 | 46,403 | 59,268
CEV | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 3,647 | 2,110 | 10,262
CEV | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,851 | 10,800 | 26,296 | 22,774
CEV | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
CEV | Operating Segments | Interruptible, off-tariff and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
ES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 4,900 | 9,500 | 14,800 | 28,500
ES | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,807 | 16,204 | 35,644 | 48,617
Revenues out of scope | 27,043 | 46,237 | 335,904 | 263,229
Total operating revenues | 38,850 | 62,441 | 371,548 | 311,846
ES | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
ES | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,807 | 16,204 | 35,644 | 48,617
ES | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
ES | Operating Segments | Interruptible, off-tariff and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
S&T | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 27,129 | 24,475 | 79,023 | 70,031
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 27,129 | 24,475 | 79,023 | 70,031
S&T | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
S&T | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 27,129 | 24,475 | 79,023 | 70,031
S&T | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 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 | 0
HSO | Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,147 | 16,299 | 46,802 | 45,885
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 16,147 | 16,299 | 46,802 | 45,885
HSO | Corporate, Non-Segment | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,107 | 16,272 | 46,630 | 45,759
HSO | Corporate, Non-Segment | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 40 | 27 | 172 | 126
HSO | Corporate, Non-Segment | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
HSO | Corporate, Non-Segment | Interruptible, off-tariff and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 0 | $ 0 | $ 0 | $ 0

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