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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 321,191 $ 364,551
Revenues out of scope 146,019 359,016
Total operating revenues 467,210 723,567
Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 213,812 234,411
Commercial and industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 81,223 103,043
Firm transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 24,435 26,199
Interruptible, off-tariff and other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,721 898
Operating Segments    
Disaggregation of Revenue [Line Items]    
Total operating revenues 452,376 709,314
Corporate, Non-Segment    
Disaggregation of Revenue [Line Items]    
Revenues out of scope 0 0
Total operating revenues 14,834 14,253
Corporate, Non-Segment | Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 14,803 14,180
Corporate, Non-Segment | Commercial and industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 31 73
Corporate, Non-Segment | Firm transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Corporate, Non-Segment | Interruptible, off-tariff and other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
NJNG | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 257,538 287,830
Revenues out of scope 35,555 69,579
Total operating revenues 293,093 357,409
NJNG | Operating Segments | Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 195,623 216,938
NJNG | Operating Segments | Commercial and industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 35,759 43,795
NJNG | Operating Segments | Firm transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 24,435 26,199
NJNG | Operating Segments | Interruptible, off-tariff and other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,721 898
CEV | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 9,364 8,906
Revenues out of scope 25,931 3,886
Total operating revenues 35,295 12,792
CEV | Operating Segments | Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 3,386 3,293
CEV | Operating Segments | Commercial and industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 5,978 5,613
CEV | Operating Segments | Firm transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
CEV | Operating Segments | Interruptible, off-tariff and other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
ES    
Disaggregation of Revenue [Line Items]    
Total operating revenues 9,500 20,000
ES | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 16,268 27,848
Revenues out of scope 84,533 285,551
Total operating revenues 100,801 313,399
ES | Operating Segments | Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
ES | Operating Segments | Commercial and industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 16,268 27,848
ES | Operating Segments | Firm transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
ES | Operating Segments | Interruptible, off-tariff and other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
S&T | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 23,187 25,714
Revenues out of scope 0 0
Total operating revenues 23,187 25,714
S&T | Operating Segments | Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
S&T | Operating Segments | Commercial and industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 23,187 25,714
S&T | Operating Segments | Firm transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
S&T | Operating Segments | Interruptible, off-tariff and other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 0 $ 0