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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 432,643 $ 339,376 $ 716,733 $ 565,103
Alternative revenue programs 2,504 (6,664) 13,158 (5,096)
Derivative instruments 478,745 472,278 863,299 24,740
Revenues out of scope 479,673 462,811 871,425 691,389
Total operating revenues 912,316 802,187 1,588,158 1,256,492
Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 381,861 296,888 605,657 486,252
Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 30,651 24,937 70,673 44,469
Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,492 8,314 16,959 16,573
Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,730 4,459 10,214 8,777
Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1,019 817 1,865 1,507
Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,846 4,882 13,316 9,270
Energy Services        
Disaggregation of Revenue [Line Items]        
Total operating revenues 10,300   32,400  
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenues 901,626 793,138 1,567,968 1,237,818
Operating Segments | Natural Gas Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 381,523 296,888 604,982 486,252
Alternative revenue programs 2,504 (6,664) 13,158 (5,096)
Derivative instruments 79,447 19,943 119,769 24,740
Revenues out of scope 81,951 13,279 132,927 19,644
Total operating revenues 463,474 310,167 737,909 505,896
Operating Segments | Natural Gas Distribution | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 381,861 296,888 605,657 486,252
Operating Segments | Natural Gas Distribution | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Natural Gas Distribution | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Natural Gas Distribution | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Natural Gas Distribution | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Natural Gas Distribution | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Clean Energy Ventures        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 7,865 5,699 15,181 10,777
Alternative revenue programs 0 0 0 0
Derivative instruments 3,962 777 6,829 2,069
Revenues out of scope 3,962 777 6,829 2,069
Total operating revenues 11,827 6,476 22,010 12,846
Operating Segments | Clean Energy Ventures | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Clean Energy Ventures | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Clean Energy Ventures | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Clean Energy Ventures | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Clean Energy Ventures | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1,019 817 1,865 1,507
Operating Segments | Clean Energy Ventures | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,846 4,882 13,316 9,270
Operating Segments | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 17,309 11,011 45,188 17,439
Alternative revenue programs 0 0 0 0
Derivative instruments 395,336 451,558 736,701 674,607
Revenues out of scope 393,760 448,755 731,669 669,676
Total operating revenues 411,069 459,766 776,857 687,115
Operating Segments | Energy Services | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Energy Services | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 17,309 11,011 45,188 17,439
Operating Segments | Energy Services | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Energy Services | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Energy Services | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Energy Services | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 12,805 13,257 24,389 25,704
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 12,805 13,257 24,389 25,704
Operating Segments | Storage and Transportation | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Storage and Transportation | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 13,342 13,926 25,485 27,030
Operating Segments | Storage and Transportation | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Storage and Transportation | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Storage and Transportation | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Storage and Transportation | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues out of scope 0 0 0 0
Total operating revenues 13,141 12,521 26,993 24,931
Home Services and Other | Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 13,141 12,521 26,993 24,931
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 13,141 12,521 26,993 24,931
Home Services and Other | Home Services and Other | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Home Services and Other | Home Services and Other | Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Home Services and Other | Home Services and Other | Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,492 8,314 16,959 16,573
Home Services and Other | Home Services and Other | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,730 4,459 10,214 8,777
Home Services and Other | Home Services and Other | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Home Services and Other | Home Services and Other | 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 (956) (921) (1,951) (1,745)
Revenues out of scope (1,576) (2,803) (5,032) (4,931)
Eliminations | Natural Gas Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (338) 0 (675) 0
Revenues out of scope 0 0 0 0
Eliminations | Clean Energy Ventures        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Revenues out of scope 0 0 0 0
Eliminations | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Revenues out of scope (1,576) (2,803) (5,032) (4,931)
Eliminations | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (537) (669) (1,096) (1,326)
Revenues out of scope 0 0 0 0
Eliminations | Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (81) (252) (180) (419)
Revenues out of scope $ 0 $ 0 $ 0 $ 0