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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 243,639 $ 155,392 $ 960,372 $ 720,495
Alternative revenue programs (1,810) 577 11,348 (4,519)
Derivative instruments 309,085 210,702 1,172,384 912,118
Revenues out of scope 308,696 212,201 1,180,121 903,590
Total operating revenues 552,335 367,593 2,140,493 1,624,085
Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 180,933 118,367 786,590 604,619
Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 36,702 15,690 107,375 60,159
Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,428 8,333 25,387 24,906
Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 5,792 4,979 16,006 13,756
Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 1,709 1,568 3,574 3,075
Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,076 7,346 24,392 16,616
Energy Services        
Disaggregation of Revenue [Line Items]        
Total operating revenues 10,300   42,700  
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenues 537,695 354,250 2,105,663 1,592,068
Operating Segments | Natural Gas Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 180,595 118,367 785,577 604,619
Alternative revenue programs (1,810) 577 11,348 (4,519)
Derivative instruments 20,572 8,682 140,341 33,422
Revenues out of scope 18,762 9,259 151,689 28,903
Total operating revenues 199,357 127,626 937,266 633,522
Operating Segments | Natural Gas Distribution | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 180,933 118,367 786,590 604,619
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 12,785 8,914 27,966 19,691
Alternative revenue programs 0 0 0 0
Derivative instruments 1,010 4,467 7,839 6,536
Revenues out of scope 1,010 4,467 7,839 6,536
Total operating revenues 13,795 13,381 35,805 26,227
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 1,709 1,568 3,574 3,075
Operating Segments | Clean Energy Ventures | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,076 7,346 24,392 16,616
Operating Segments | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 20,312 4,041 65,500 21,480
Alternative revenue programs 0 0 0 0
Derivative instruments 287,503 197,553 1,024,204 872,160
Revenues out of scope 288,924 198,475 1,020,593 868,151
Total operating revenues 309,236 202,516 1,086,093 889,631
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 20,312 4,041 65,500 21,480
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 15,779 10,999 40,168 36,703
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 15,779 10,999 40,168 36,703
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 16,390 11,649 41,875 38,679
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 14,168 13,071 41,161 38,002
Home Services and Other | Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 14,168 13,071 41,161 38,002
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 14,168 13,071 41,161 38,002
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 8,428 8,333 25,387 24,906
Home Services and Other | Home Services and Other | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 5,792 4,979 16,006 13,756
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 (1,001) (891) (2,952) (2,636)
Revenues out of scope 1,421 922 (3,611) (4,009)
Eliminations | Natural Gas Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (338) 0 (1,013) 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 1,421 922 (3,611) (4,009)
Eliminations | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (611) (650) (1,707) (1,976)
Revenues out of scope 0 0 0 0
Eliminations | Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (52) (241) (232) (660)
Revenues out of scope $ 0 $ 0 $ 0 $ 0