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REVENUE - DISAGGREGATED REVENUE - PRODUCT (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
Alternative revenue programs 48 (1,033) (25,487) 3,812
Derivative instruments 64,062 66,777 562,834 427,817
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
Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 168,140 138,804 973,993 767,698
Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 38,936 40,679 114,708 119,996
Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 9,381 9,062 27,883 27,073
Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,796 7,294 19,206 19,022
Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,964 4,872 10,726 10,194
Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,887 9,575 17,680 22,842
ES        
Disaggregation of Revenue [Line Items]        
Total operating revenues 4,900 9,500 14,800 28,500
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenues 282,799 259,337 1,653,532 1,354,874
Operating Segments | NJNG        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 167,902 138,467 973,112 766,686
Alternative revenue programs 48 (1,033) (25,487) 3,812
Derivative instruments 36,840 20,339 208,933 143,231
Revenues out of scope 36,888 19,306 183,446 147,043
Total operating revenues 204,790 157,773 1,156,558 913,729
Operating Segments | NJNG | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 168,140 138,804 973,993 767,698
Operating Segments | NJNG | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | NJNG | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | NJNG | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | NJNG | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | NJNG | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | CEV        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,851 14,447 28,406 33,036
Alternative revenue programs 0 0 0 0
Derivative instruments 179 201 17,997 26,232
Revenues out of scope 179 201 17,997 26,232
Total operating revenues 12,030 14,648 46,403 59,268
Operating Segments | CEV | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | CEV | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | CEV | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | CEV | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | CEV | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,964 4,872 10,726 10,194
Operating Segments | CEV | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,887 9,575 17,680 22,842
Operating Segments | ES        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,807 16,204 35,644 48,617
Alternative revenue programs 0 0 0 0
Derivative instruments 27,043 46,237 335,904 258,354
Revenues out of scope 27,043 46,237 335,904 263,229
Total operating revenues 38,850 62,441 371,548 311,846
Operating Segments | ES | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | ES | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,807 16,204 35,644 48,617
Operating Segments | ES | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | ES | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | ES | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | ES | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | S&T        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 27,129 24,475 79,023 70,031
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 27,129 24,475 79,023 70,031
Operating Segments | S&T | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | S&T | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 27,129 24,475 79,064 71,379
Operating Segments | S&T | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | S&T | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | S&T | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | S&T | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Corporate, Non-Segment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 16,147 16,299 46,802 45,885
Corporate, Non-Segment | HSO        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,147 16,299 46,802 45,885
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 16,147 16,299 46,802 45,885
Corporate, Non-Segment | HSO | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Corporate, Non-Segment | HSO | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Corporate, Non-Segment | HSO | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 9,381 9,062 27,883 27,073
Corporate, Non-Segment | HSO | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,796 7,294 19,206 19,022
Corporate, Non-Segment | HSO | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Corporate, Non-Segment | HSO | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Eliminations        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (268) (394) (1,209) (2,570)
Revenues out of scope       4,875
Total operating revenues (268) (394) (1,209)  
Eliminations | NJNG        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (238) (337) (881) (1,012)
Revenues out of scope       0
Eliminations | CEV        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Revenues out of scope       0
Eliminations | ES        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Revenues out of scope       4,875
Eliminations | S&T        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 (41) (1,348)
Revenues out of scope       0
Eliminations | HSO        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ (30) $ (57) $ (287) (210)
Revenues out of scope       $ 0