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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 358,953 $ 321,191
Alternative revenue programs (5,391) (2,537)
Derivative instruments 134,799 147,423
Revenues out of scope 129,408 146,019
Total operating revenues 488,361 467,210
Natural gas utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 296,402 257,875
Natural gas services    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 38,575 40,130
Service contracts    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 9,232 8,940
Installations and maintenance    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6,562 5,894
Renewable energy certificates    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 2,896 2,650
Electricity sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 5,826 6,714
ES    
Disaggregation of Revenue [Line Items]    
Total operating revenues 4,900 9,500
Operating Segments    
Disaggregation of Revenue [Line Items]    
Total operating revenues 472,728 452,376
Operating Segments | NJNG    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 296,065 257,538
Alternative revenue programs (5,391) (2,537)
Derivative instruments 42,754 38,092
Revenues out of scope 37,363 35,555
Total operating revenues 333,428 293,093
Operating Segments | NJNG | Natural gas utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 296,402 257,875
Operating Segments | NJNG | Natural gas services    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | NJNG | Service contracts    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | NJNG | Installations and maintenance    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | NJNG | Renewable energy certificates    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | NJNG | Electricity sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | CEV    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 8,722 9,364
Alternative revenue programs 0 0
Derivative instruments 17,684 25,931
Revenues out of scope 17,684 25,931
Total operating revenues 26,406 35,295
Operating Segments | CEV | Natural gas utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | CEV | Natural gas services    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | CEV | Service contracts    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | CEV | Installations and maintenance    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | CEV | Renewable energy certificates    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 2,896 2,650
Operating Segments | CEV | Electricity sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 5,826 6,714
Operating Segments | ES    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 11,947 16,268
Alternative revenue programs 0 0
Derivative instruments 74,361 83,400
Revenues out of scope 74,361 84,533
Total operating revenues 86,308 100,801
Operating Segments | ES | Natural gas utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | ES | Natural gas services    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 11,947 16,268
Operating Segments | ES | Service contracts    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | ES | Installations and maintenance    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | ES | Renewable energy certificates    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | ES | Electricity sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | S&T    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 26,586 23,187
Alternative revenue programs 0 0
Derivative instruments 0 0
Revenues out of scope 0 0
Total operating revenues 26,586 23,187
Operating Segments | S&T | Natural gas utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | S&T | Natural gas services    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 26,628 23,862
Operating Segments | S&T | Service contracts    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | S&T | Installations and maintenance    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | S&T | Renewable energy certificates    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | S&T | Electricity sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Corporate, Non-Segment    
Disaggregation of Revenue [Line Items]    
Revenues out of scope 0 0
Total operating revenues 15,633 14,834
Corporate, Non-Segment | HSO    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 15,633 14,834
Alternative revenue programs 0 0
Derivative instruments 0 0
Revenues out of scope 0 0
Total operating revenues 15,633 14,834
Corporate, Non-Segment | HSO | Natural gas utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Corporate, Non-Segment | HSO | Natural gas services    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Corporate, Non-Segment | HSO | Service contracts    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 9,232 8,940
Corporate, Non-Segment | HSO | Installations and maintenance    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6,562 5,894
Corporate, Non-Segment | HSO | Renewable energy certificates    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Corporate, Non-Segment | HSO | Electricity sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers (540) (1,012)
Revenues out of scope   1,133
Total operating revenues (540)  
Eliminations | NJNG    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers (337) (337)
Revenues out of scope   0
Eliminations | CEV    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Revenues out of scope   0
Eliminations | ES    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Revenues out of scope   1,133
Eliminations | S&T    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers (42) (675)
Revenues out of scope   0
Eliminations | HSO    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ (161) 0
Revenues out of scope   $ 0