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REVENUE - DISAGGREGATED REVENUE - PRODUCT (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
Alternative revenue programs | 48 | (1,033) | (25,487) | 3,812
Derivative instruments | 64,062 | 66,777 | 562,834 | 427,817
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
Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 168,140 | 138,804 | 973,993 | 767,698
Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 38,936 | 40,679 | 114,708 | 119,996
Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,381 | 9,062 | 27,883 | 27,073
Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,796 | 7,294 | 19,206 | 19,022
Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,964 | 4,872 | 10,726 | 10,194
Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,887 | 9,575 | 17,680 | 22,842
ES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 4,900 | 9,500 | 14,800 | 28,500
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 282,799 | 259,337 | 1,653,532 | 1,354,874
Operating Segments | NJNG |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 167,902 | 138,467 | 973,112 | 766,686
Alternative revenue programs | 48 | (1,033) | (25,487) | 3,812
Derivative instruments | 36,840 | 20,339 | 208,933 | 143,231
Revenues out of scope | 36,888 | 19,306 | 183,446 | 147,043
Total operating revenues | 204,790 | 157,773 | 1,156,558 | 913,729
Operating Segments | NJNG | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 168,140 | 138,804 | 973,993 | 767,698
Operating Segments | NJNG | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | NJNG | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | NJNG | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | NJNG | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | NJNG | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | CEV |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,851 | 14,447 | 28,406 | 33,036
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 179 | 201 | 17,997 | 26,232
Revenues out of scope | 179 | 201 | 17,997 | 26,232
Total operating revenues | 12,030 | 14,648 | 46,403 | 59,268
Operating Segments | CEV | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | CEV | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | CEV | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | CEV | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | CEV | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,964 | 4,872 | 10,726 | 10,194
Operating Segments | CEV | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,887 | 9,575 | 17,680 | 22,842
Operating Segments | ES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,807 | 16,204 | 35,644 | 48,617
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 27,043 | 46,237 | 335,904 | 258,354
Revenues out of scope | 27,043 | 46,237 | 335,904 | 263,229
Total operating revenues | 38,850 | 62,441 | 371,548 | 311,846
Operating Segments | ES | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | ES | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,807 | 16,204 | 35,644 | 48,617
Operating Segments | ES | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | ES | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | ES | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | ES | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | S&T |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 27,129 | 24,475 | 79,023 | 70,031
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 27,129 | 24,475 | 79,023 | 70,031
Operating Segments | S&T | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | S&T | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 27,129 | 24,475 | 79,064 | 71,379
Operating Segments | S&T | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | S&T | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | S&T | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | S&T | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate, Non-Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 16,147 | 16,299 | 46,802 | 45,885
Corporate, Non-Segment | HSO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,147 | 16,299 | 46,802 | 45,885
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 16,147 | 16,299 | 46,802 | 45,885
Corporate, Non-Segment | HSO | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate, Non-Segment | HSO | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate, Non-Segment | HSO | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,381 | 9,062 | 27,883 | 27,073
Corporate, Non-Segment | HSO | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,796 | 7,294 | 19,206 | 19,022
Corporate, Non-Segment | HSO | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate, Non-Segment | HSO | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (268) | (394) | (1,209) | (2,570)
Revenues out of scope |  |  |  | 4,875
Total operating revenues | (268) | (394) | (1,209) |
Eliminations | NJNG |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (238) | (337) | (881) | (1,012)
Revenues out of scope |  |  |  | 0
Eliminations | CEV |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope |  |  |  | 0
Eliminations | ES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope |  |  |  | 4,875
Eliminations | S&T |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | (41) | (1,348)
Revenues out of scope |  |  |  | 0
Eliminations | HSO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ (30) | $ (57) | $ (287) | (210)
Revenues out of scope |  |  |  | $ 0

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