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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | $ 298,946 | $ 275,636 | $ 1,700,334 | $ 1,400,759
Depreciation and amortization | 47,000 | 40,907 | 140,296 | 121,269
Interest income | 2,340 | 2,235 | 6,554 | 6,297
Interest expense, net of capitalized interest | 31,694 | 31,169 | 98,112 | 94,263
Income tax provision (benefit) | (5,142) | (2,764) | 93,835 | 54,119
Equity in earnings of affiliates | 1,523 | 1,340 | 4,375 | 3,738
Net financial earnings (loss) | 6,198 | (8,899) | 313,388 | 202,121
Capital expenditures | 156,930 | 158,484 | 443,503 | 395,786
ES |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 4,900 | 9,500 | 14,800 | 28,500
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 282,799 | 259,337 | 1,653,532 | 1,354,874
Depreciation and amortization | 46,598 | 41,756 | 139,467 | 122,483
Interest income | 3,278 | 3,296 | 9,500 | 9,550
Interest expense, net of capitalized interest | 31,447 | 30,985 | 97,404 | 93,655
Income tax provision (benefit) | (5,499) | (3,348) | 93,157 | 47,772
Equity in earnings of affiliates | 908 | 782 | 3,030 | 1,860
Net financial earnings (loss) | 5,386 | (10,957) | 312,138 | 203,584
Capital expenditures | 156,905 | 158,232 | 442,905 | 394,048
Operating Segments | NJNG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 204,790 | 157,773 | 1,156,558 | 913,729
Depreciation and amortization | 35,987 | 28,491 | 103,784 | 82,872
Interest income | 687 | 571 | 1,934 | 1,666
Interest expense, net of capitalized interest | 16,184 | 14,239 | 50,897 | 43,840
Income tax provision (benefit) | 2,489 | (1,132) | 63,980 | 34,000
Equity in earnings of affiliates | 0 | 0 | 0 | 0
Net financial earnings (loss) | 10,079 | (6,139) | 221,518 | 152,400
Capital expenditures | 103,402 | 110,302 | 306,638 | 287,727
Operating Segments | CEV |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 12,030 | 14,648 | 46,403 | 59,268
Depreciation and amortization | 5,772 | 6,981 | 17,701 | 20,834
Interest income | 280 | 0 | 530 | 0
Interest expense, net of capitalized interest | 6,629 | 7,027 | 18,940 | 21,656
Income tax provision (benefit) | (2,068) | (2,008) | 10,994 | (471)
Equity in earnings of affiliates | 0 | 0 | 0 | 0
Net financial earnings (loss) | (6,857) | (6,714) | 37,315 | (1,808)
Capital expenditures | 49,276 | 37,013 | 117,978 | 74,096
Operating Segments | ES |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 38,850 | 62,441 | 371,548 | 311,846
Depreciation and amortization | 30 | 45 | 139 | 158
Interest income | 36 | 151 | 109 | 422
Interest expense, net of capitalized interest | 2,893 | 3,946 | 10,040 | 10,585
Income tax provision (benefit) | (7,792) | (1,553) | 14,088 | 11,247
Equity in earnings of affiliates | 0 | 0 | 0 | 0
Net financial earnings (loss) | (3,734) | (2,244) | 39,400 | 43,231
Capital expenditures | 0 | 0 | 0 | 0
Operating Segments | S&T |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 27,129 | 24,475 | 79,023 | 70,031
Depreciation and amortization | 4,809 | 6,239 | 17,843 | 18,619
Interest income | 2,275 | 2,574 | 6,927 | 7,462
Interest expense, net of capitalized interest | 5,741 | 5,773 | 17,527 | 17,574
Income tax provision (benefit) | 1,872 | 1,345 | 4,095 | 2,996
Equity in earnings of affiliates | 908 | 782 | 3,030 | 1,860
Net financial earnings (loss) | 5,898 | 4,140 | 13,905 | 9,761
Capital expenditures | 4,227 | 10,917 | 18,289 | 32,225
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 238 | 337 | 922 | (2,515)
Intersegment Eliminations | NJNG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 238 | 337 | 881 | 1,012
Intersegment Eliminations | CEV |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | ES |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 0 | 0 | 0 | (4,875)
Intersegment Eliminations | S&T |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 0 | 0 | 41 | 1,348
Corporate, Non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 16,147 | 16,299 | 46,802 | 45,885
Depreciation and amortization | 403 | 308 | 830 | 808
Interest income | 324 | 386 | 898 | 1,074
Interest expense, net of capitalized interest | 247 | 184 | 708 | 608
Income tax provision (benefit) | 687 | 640 | 1,510 | 1,108
Equity in earnings of affiliates | 0 | 0 | 0 | 0
Net financial earnings (loss) | 481 | 881 | 418 | 665
Capital expenditures | 25 | 252 | 598 | 1,738
Corporate Reconciling Items and Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 30 | 57 | 287 | 210
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | (268) | (394) | (1,209) |
Depreciation and amortization | (1) | (1,157) | (1) | (2,022)
Interest income | (1,262) | (1,447) | (3,844) | (4,327)
Interest expense, net of capitalized interest | 0 | 0 | 0 | 0
Income tax provision (benefit) | (330) | (56) | (832) | 5,239
Equity in earnings of affiliates | 615 | 558 | 1,345 | 1,878
Net financial earnings (loss) | 331 | 1,177 | 832 | (2,128)
Capital expenditures | $ 0 | $ 0 | $ 0 | 0
Eliminations and Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  |  |  | $ 2,305

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