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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 234,836 $ 209,892 $ 1,162,987 $ 964,255
Revenues out of scope 64,110 65,744 537,347 436,504
Total operating revenues 298,946 275,636 1,700,334 1,400,759
Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 130,985 117,031 779,537 636,580
Commercial and industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 78,797 72,785 284,406 248,948
Firm transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 22,011 17,481 91,744 72,596
Interruptible, off-tariff and other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3,043 2,595 7,300 6,131
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenues 282,799 259,337 1,653,532 1,354,874
Corporate, Non-Segment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 16,147 16,299 46,802 45,885
NJNG | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 167,902 138,467 973,112 766,686
Revenues out of scope 36,888 19,306 183,446 147,043
Total operating revenues 204,790 157,773 1,156,558 913,729
NJNG | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 114,878 97,112 730,797 580,559
NJNG | Operating Segments | Commercial and industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 27,970 21,279 143,271 107,400
NJNG | Operating Segments | Firm transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 22,011 17,481 91,744 72,596
NJNG | Operating Segments | Interruptible, off-tariff and other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 3,043 2,595 7,300 6,131
CEV | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,851 14,447 28,406 33,036
Revenues out of scope 179 201 17,997 26,232
Total operating revenues 12,030 14,648 46,403 59,268
CEV | Operating Segments | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 3,647 2,110 10,262
CEV | Operating Segments | Commercial and industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,851 10,800 26,296 22,774
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 4,900 9,500 14,800 28,500
ES | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,807 16,204 35,644 48,617
Revenues out of scope 27,043 46,237 335,904 263,229
Total operating revenues 38,850 62,441 371,548 311,846
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 11,807 16,204 35,644 48,617
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 27,129 24,475 79,023 70,031
Revenues out of scope 0 0 0 0
Total operating revenues 27,129 24,475 79,023 70,031
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 27,129 24,475 79,023 70,031
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
HSO | Corporate, Non-Segment        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,147 16,299 46,802 45,885
Revenues out of scope 0 0 0 0
Total operating revenues 16,147 16,299 46,802 45,885
HSO | Corporate, Non-Segment | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,107 16,272 46,630 45,759
HSO | Corporate, Non-Segment | Commercial and industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 40 27 172 126
HSO | Corporate, Non-Segment | Firm transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
HSO | Corporate, Non-Segment | Interruptible, off-tariff and other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 0 $ 0 $ 0 $ 0