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REVENUE - DISAGGREGATED REVENUE - TYPE (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
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
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 305,737 | 263,916 | 519,549 | 498,327
Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 94,940 | 90,385 | 176,163 | 193,428
Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 30,680 | 29,368 | 55,115 | 55,567
Interruptible, off-tariff and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,815 | 764 | 3,536 | 1,662
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 643,161 | 630,762 | 1,095,537 | 1,340,076
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 | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 14,684 | 13,089 | 29,487 | 27,269
Corporate, Non-Segment | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 68 | 176 | 99 | 249
Corporate, Non-Segment | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Corporate, Non-Segment | Interruptible, off-tariff and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
NJNG | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 370,681 | 326,860 | 628,219 | 614,690
Revenues out of scope | 92,182 | 73,640 | 127,737 | 143,219
Total operating revenues | 462,863 | 400,500 | 755,956 | 757,909
NJNG | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 287,824 | 247,623 | 483,447 | 464,561
NJNG | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 50,362 | 49,105 | 86,121 | 92,900
NJNG | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 30,680 | 29,368 | 55,115 | 55,567
NJNG | Operating Segments | Interruptible, off-tariff and other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,815 | 764 | 3,536 | 1,662
CEV | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 9,225 | 8,169 | 18,589 | 17,075
Revenues out of scope | 100 | 6,237 | 26,031 | 10,123
Total operating revenues | 9,325 | 14,406 | 44,620 | 27,198
CEV | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,229 | 3,204 | 6,615 | 6,497
CEV | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 5,996 | 4,965 | 11,974 | 10,578
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 | 9,500 | 9,500 | 19,000 | 29,500
ES | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,145 | 16,836 | 32,413 | 44,684
Revenues out of scope | 132,459 | 179,717 | 216,992 | 465,268
Total operating revenues | 148,604 | 196,553 | 249,405 | 509,952
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 | 16,145 | 16,836 | 32,413 | 44,684
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 | 22,369 | 19,303 | 45,556 | 45,017
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 22,369 | 19,303 | 45,556 | 45,017
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 | 22,369 | 19,303 | 45,556 | 45,017
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

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