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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