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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Segment Reporting Information [Line Items] |  |  |
Operating revenues | $ 1,796,539 | $ 1,962,994 | $ 2,905,979
Depreciation and amortization | 166,567 | 152,941 | 129,249
Interest income | 8,669 | 8,919 | 2,716
Interest expense, net of capitalized interest | 130,275 | 123,014 | 85,830
Income tax provision (benefit) | 84,906 | 49,275 | 76,195
Equity in earnings of affiliates | 5,299 | 3,930 | 8,177
Net financial earnings | 290,828 | 261,827 | 240,321
Capital expenditures | 571,319 | 540,919 | 598,428
Return of capital from equity investees |  |  | (5,479)
Nonutility | 778,057 | 951,710 | 1,778,562
ES |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 137,200 | 48,500 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 1,734,162 | 1,905,561 | 2,850,161
Depreciation and amortization | 165,466 | 152,052 | 128,425
Interest income | 13,072 | 9,789 | 3,021
Interest expense, net of capitalized interest | 129,507 | 122,367 | 85,184
Income tax provision (benefit) | 81,081 | 53,169 | 75,157
Equity in earnings of affiliates | 2,816 | 3,126 | 9,865
Net financial earnings | 290,806 | 257,224 | 241,102
Capital expenditures | 569,078 | 538,613 | 597,038
Return of capital from equity investees |  |  | (5,479)
Operating Segments | NJNG |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 1,018,482 | 1,011,284 | 1,127,417
Depreciation and amortization | 112,492 | 102,326 | 94,579
Interest income | 2,448 | 1,713 | 895
Interest expense, net of capitalized interest | 62,288 | 56,595 | 46,394
Income tax provision (benefit) | 31,793 | 33,065 | 40,141
Equity in earnings of affiliates | 0 | 0 | 0
Net financial earnings | 133,400 | 131,414 | 140,124
Capital expenditures | 419,453 | 390,394 | 298,374
Return of capital from equity investees |  |  | 0
Operating Segments | CEV |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 130,563 | 124,131 | 128,280
Depreciation and amortization | 27,869 | 25,320 | 21,396
Interest income | 0 | 0 | 0
Interest expense, net of capitalized interest | 28,545 | 28,569 | 21,968
Income tax provision (benefit) | 11,406 | (7,683) | 11,361
Equity in earnings of affiliates | 0 | 0 | 0
Net financial earnings | 33,662 | 44,458 | 39,403
Capital expenditures | 104,287 | 107,303 | 146,676
Return of capital from equity investees |  |  | 0
Operating Segments | ES |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 490,266 | 681,446 | 1,529,178
Depreciation and amortization | 205 | 221 | 148
Interest income | 452 | 1,119 | 16
Interest expense, net of capitalized interest | 15,233 | 11,400 | 4,725
Income tax provision (benefit) | 33,331 | 24,343 | 21,776
Equity in earnings of affiliates | 0 | 0 | 0
Net financial earnings | 111,515 | 68,517 | 39,121
Capital expenditures | 0 | 0 | 0
Return of capital from equity investees |  |  | 0
Operating Segments | ES | CANADA |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 0 | 8,400 | 2,400
Operating Segments | S&T |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 94,851 | 88,700 | 65,286
Depreciation and amortization | 24,900 | 24,185 | 12,302
Interest income | 10,172 | 6,957 | 2,110
Interest expense, net of capitalized interest | 23,441 | 25,803 | 12,097
Income tax provision (benefit) | 4,551 | 3,444 | 1,879
Equity in earnings of affiliates | 2,816 | 3,126 | 9,865
Net financial earnings | 12,229 | 12,835 | 22,454
Capital expenditures | 45,338 | 40,916 | 151,988
Return of capital from equity investees |  |  | (5,479)
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | (2,167) | 15,678 | 3,893
Intersegment Eliminations | NJNG |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 1,350 | 1,349 | 1,350
Intersegment Eliminations | CEV |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
Intersegment Eliminations | ES |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | (4,875) | 10,170 | 94
Intersegment Eliminations | S&T |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 1,358 | 4,159 | 2,449
Corporate, Non-Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 62,377 | 57,433 | 55,818
Depreciation and amortization | 1,101 | 889 | 824
Interest income | 1,423 | 2,977 | 944
Interest expense, net of capitalized interest | 768 | 647 | 646
Income tax provision (benefit) | 2,666 | (1,477) | 1,059
Equity in earnings of affiliates | 0 | 0 | 0
Net financial earnings | 26 | 4,758 | (781)
Capital expenditures | 2,241 | 2,306 | 1,390
Return of capital from equity investees |  |  | 0
Corporate Reconciling Items and Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 258 | 205 | 364
Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues |  | (15,883) | (4,257)
Depreciation and amortization | 0 | 0 | 0
Interest income | (5,826) | (3,847) | (1,249)
Interest expense, net of capitalized interest | 0 | 0 | 0
Income tax provision (benefit) | 1,159 | (2,417) | (21)
Equity in earnings of affiliates | 2,483 | 804 | (1,688)
Net financial earnings | (4) | (155) | 0
Capital expenditures | 0 | $ 0 | 0
Return of capital from equity investees |  |  | $ 0
Eliminations and Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | $ 1,909 |  |

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