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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 209,892 $ 199,315 $ 964,255 $ 948,299
Revenues out of scope 65,744 64,760 436,504 683,370
Total operating revenues 275,636 264,075 1,400,759 1,631,669
Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 117,031 112,847 636,580 611,174
Commercial and industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 72,785 67,112 248,948 260,540
Firm transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 17,481 18,088 72,596 73,655
Interruptible, off-tariff and other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,595 1,268 6,131 2,930
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenues 259,337 249,126 1,354,874 1,589,202
Corporate, Non-Segment        
Disaggregation of Revenue [Line Items]        
Revenues out of scope 0 0 0 0
Total operating revenues 16,299 14,949 45,885 42,467
Corporate, Non-Segment | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,272 14,922 45,759 42,191
Corporate, Non-Segment | Commercial and industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 27 27 126 276
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 138,467 133,916 766,686 748,606
Revenues out of scope 19,306 11,055 147,043 154,274
Total operating revenues 157,773 144,971 913,729 902,880
NJNG | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 97,112 94,340 580,559 558,901
NJNG | Operating Segments | Commercial and industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 21,279 20,220 107,400 113,120
NJNG | Operating Segments | Firm transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 17,481 18,088 72,596 73,655
NJNG | Operating Segments | Interruptible, off-tariff and other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,595 1,268 6,131 2,930
CEV | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 14,447 12,994 33,036 30,069
Revenues out of scope 201 184 26,232 10,307
Total operating revenues 14,648 13,178 59,268 40,376
CEV | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3,647 3,585 10,262 10,082
CEV | Operating Segments | Commercial and industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 10,800 9,409 22,774 19,987
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 28,500 39,000
ES | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,204 16,021 48,617 60,705
Revenues out of scope 46,237 53,521 263,229 518,789
Total operating revenues 62,441 69,542 311,846 579,494
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 16,204 16,021 48,617 60,705
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 24,475 21,435 70,031 66,452
Revenues out of scope 0 0 0 0
Total operating revenues 24,475 21,435 70,031 66,452
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 24,475 21,435 70,031 66,452
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