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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 433,172 | $ 384,433 | $ 754,363 | $ 748,984
Alternative revenue programs | 7,382 | 27,270 | 4,845 | 23,805
Derivative instruments | 213,617 | 232,501 | 361,040 | 603,365
Revenues out of scope | 224,741 | 259,594 | 370,760 | 618,610
Total operating revenues | 657,913 | 644,027 | 1,125,123 | 1,367,594
Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 371,019 | 327,198 | 628,894 | 615,365
Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 39,187 | 37,723 | 79,317 | 92,409
Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,071 | 8,739 | 18,011 | 17,400
Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 5,834 | 4,709 | 11,728 | 10,314
Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,672 | 2,085 | 5,322 | 3,287
Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,553 | 6,084 | 13,267 | 13,788
ES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 9,500 | 9,500 | 19,000 | 29,500
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 643,161 | 630,762 | 1,095,537 | 1,340,076
Operating Segments | NJNG |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 370,681 | 326,860 | 628,219 | 614,690
Alternative revenue programs | 7,382 | 27,270 | 4,845 | 23,805
Derivative instruments | 84,800 | 46,370 | 122,892 | 119,414
Revenues out of scope | 92,182 | 73,640 | 127,737 | 143,219
Total operating revenues | 462,863 | 400,500 | 755,956 | 757,909
Operating Segments | NJNG | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 371,019 | 327,198 | 628,894 | 615,365
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 | 9,225 | 8,169 | 18,589 | 17,075
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 100 | 6,237 | 26,031 | 10,123
Revenues out of scope | 100 | 6,237 | 26,031 | 10,123
Total operating revenues | 9,325 | 14,406 | 44,620 | 27,198
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 | 2,672 | 2,085 | 5,322 | 3,287
Operating Segments | CEV | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,553 | 6,084 | 13,267 | 13,788
Operating Segments | ES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,145 | 16,836 | 32,413 | 44,684
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 128,717 | 179,894 | 212,117 | 473,828
Revenues out of scope | 132,459 | 179,717 | 216,992 | 465,268
Total operating revenues | 148,604 | 196,553 | 249,405 | 509,952
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 | 16,145 | 16,836 | 32,413 | 44,684
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 | 22,369 | 19,303 | 45,556 | 45,017
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 22,369 | 19,303 | 45,556 | 45,017
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 | 23,042 | 20,887 | 46,904 | 47,725
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] |  |  |  |
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 14,752 | 13,265 | 29,586 | 27,518
Corporate, Non-Segment | HSO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 14,752 | 13,265 | 29,586 | 27,518
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 14,752 | 13,265 | 29,586 | 27,518
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 | 9,071 | 8,739 | 18,011 | 17,400
Corporate, Non-Segment | HSO | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 5,834 | 4,709 | 11,728 | 10,314
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 | (1,164) | (2,105) | (2,176) | (3,579)
Revenues out of scope | 3,742 | (177) | 4,875 | (8,560)
Total operating revenues |  | (2,282) |  | (12,139)
Eliminations | NJNG |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (338) | (338) | (675) | (675)
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | CEV |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | ES |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope | 3,742 | (177) | 4,875 | (8,560)
Eliminations | S&T |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (673) | (1,584) | (1,348) | (2,708)
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | HSO |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (153) | (183) | (153) | (196)
Revenues out of scope | $ 0 | $ 0 | $ 0 | $ 0

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