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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | $ 657,913 | $ 644,027 | $ 1,125,123 | $ 1,367,594
Depreciation and amortization | 40,075 | 38,090 | 80,362 | 74,773
Interest income | 2,036 | 2,236 | 4,062 | 4,195
Interest expense, net of capitalized interest | 31,621 | 30,261 | 63,094 | 59,752
Income tax provision (benefit) | 33,947 | 30,586 | 56,883 | 63,564
Equity in earnings of affiliates | 738 | 1,131 | 2,398 | 2,077
Net financial earnings (loss) | 138,576 | 112,310 | 211,020 | 222,594
Capital expenditures | 122,680 | 117,188 | 237,302 | 263,111
ES |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 9,500 | 9,500 | 19,000 | 29,500
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 643,161 | 630,762 | 1,095,537 | 1,340,076
Depreciation and amortization | 40,669 | 37,866 | 80,727 | 74,331
Interest income | 3,178 | 2,440 | 6,254 | 4,523
Interest expense, net of capitalized interest | 31,413 | 30,072 | 62,670 | 59,441
Income tax provision (benefit) | 28,790 | 27,431 | 51,120 | 61,984
Equity in earnings of affiliates | 85 | 977 | 1,078 | 1,886
Net financial earnings (loss) | 141,104 | 114,893 | 214,541 | 224,751
Capital expenditures | 122,550 | 116,428 | 235,816 | 262,211
Operating Segments | NJNG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 462,863 | 400,500 | 755,956 | 757,909
Depreciation and amortization | 27,464 | 25,319 | 54,381 | 50,209
Interest income | 517 | 376 | 1,095 | 789
Interest expense, net of capitalized interest | 14,850 | 13,879 | 29,601 | 27,588
Income tax provision (benefit) | 24,476 | 23,924 | 35,132 | 38,307
Equity in earnings of affiliates | 0 | 0 | 0 | 0
Net financial earnings (loss) | 107,095 | 100,697 | 158,539 | 155,361
Capital expenditures | 97,710 | 92,600 | 177,425 | 174,671
Operating Segments | CEV |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 9,325 | 14,406 | 44,620 | 27,198
Depreciation and amortization | 6,931 | 6,465 | 13,853 | 12,041
Interest income | 0 | 0 | 0 | 0
Interest expense, net of capitalized interest | 7,182 | 7,316 | 14,629 | 13,211
Income tax provision (benefit) | (1,594) | (3,005) | 1,537 | (4,842)
Equity in earnings of affiliates | 0 | 0 | 0 | 0
Net financial earnings (loss) | (5,616) | (9,379) | 4,906 | (12,961)
Capital expenditures | 11,317 | 13,706 | 37,083 | 57,699
Operating Segments | ES |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 148,604 | 196,553 | 249,405 | 509,952
Depreciation and amortization | 56 | 62 | 113 | 119
Interest income | 143 | 380 | 271 | 649
Interest expense, net of capitalized interest | 3,513 | 2,749 | 6,639 | 5,807
Income tax provision (benefit) | 5,289 | 5,916 | 12,800 | 25,980
Equity in earnings of affiliates | 0 | 0 | 0 | 0
Net financial earnings (loss) | 37,644 | 21,125 | 45,475 | 73,658
Capital expenditures | 0 | 0 | 0 | 0
Operating Segments | S&T |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 22,369 | 19,303 | 45,556 | 45,017
Depreciation and amortization | 6,218 | 6,020 | 12,380 | 11,962
Interest income | 2,518 | 1,684 | 4,888 | 3,085
Interest expense, net of capitalized interest | 5,868 | 6,128 | 11,801 | 12,835
Income tax provision (benefit) | 619 | 596 | 1,651 | 2,539
Equity in earnings of affiliates | 85 | 977 | 1,078 | 1,886
Net financial earnings (loss) | 1,981 | 2,450 | 5,621 | 8,693
Capital expenditures | 13,523 | 10,122 | 21,308 | 29,841
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | (2,731) | 2,099 | (2,852) | 11,943
Intersegment Eliminations | NJNG |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 338 | 338 | 675 | 675
Intersegment Eliminations | CEV |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | ES |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | (3,742) | 177 | (4,875) | 8,560
Intersegment Eliminations | S&T |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 673 | 1,584 | 1,348 | 2,708
Corporate, Non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 14,752 | 13,265 | 29,586 | 27,518
Depreciation and amortization | 271 | 224 | 500 | 442
Interest income | 332 | 734 | 688 | 1,388
Interest expense, net of capitalized interest | 208 | 189 | 424 | 311
Income tax provision (benefit) | 520 | 488 | 468 | 705
Equity in earnings of affiliates | 0 | 0 | 0 | 0
Net financial earnings (loss) | 384 | 813 | (216) | 784
Capital expenditures | 130 | 760 | 1,486 | 900
Corporate Reconciling Items And Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 153 | 183 | 153 | 196
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues |  | (2,282) |  | (12,139)
Depreciation and amortization | (865) | 0 | (865) | 0
Interest income | (1,474) | (938) | (2,880) | (1,716)
Interest expense, net of capitalized interest | 0 | 0 | 0 | 0
Income tax provision (benefit) | 4,637 | 2,667 | 5,295 | 875
Equity in earnings of affiliates | 653 | 154 | 1,320 | 191
Net financial earnings (loss) | (2,912) | (3,396) | (3,305) | (2,941)
Capital expenditures | 0 | $ 0 | 0 | $ 0
Eliminations And Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | $ 2,578 |  | $ 2,699 |

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