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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 199,315 $ 243,639 $ 948,299 $ 960,372
Alternative revenue programs 5,211 (1,810) 29,016 11,348
Derivative instruments 60,179 309,085 663,544 1,172,384
Revenues out of scope 64,760 308,696 683,370 1,180,121
Total operating revenues 264,075 552,335 1,631,669 2,140,493
Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 134,253 180,933 749,618 786,590
Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 38,222 36,702 130,631 107,375
Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,842 8,428 26,242 25,387
Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,113 5,792 16,427 16,006
Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,720 1,709 8,007 3,574
Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,274 11,076 22,062 24,392
Energy Services        
Disaggregation of Revenue [Line Items]        
Total operating revenues 9,500 10,300 39,000 42,700
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenues 250,859 537,695 1,602,878 2,105,663
Operating Segments | Natural Gas Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 133,916 180,595 748,606 785,577
Alternative revenue programs 5,211 (1,810) 29,016 11,348
Derivative instruments 5,844 20,572 125,258 140,341
Revenues out of scope 11,055 18,762 154,274 151,689
Total operating revenues 144,971 199,357 902,880 937,266
Operating Segments | Natural Gas Distribution | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 134,253 180,933 749,618 786,590
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 12,994 12,785 30,069 27,966
Alternative revenue programs 0 0 0 0
Derivative instruments 184 1,010 10,307 7,839
Revenues out of scope 184 1,010 10,307 7,839
Total operating revenues 13,178 13,795 40,376 35,805
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 4,720 1,709 8,007 3,574
Operating Segments | Clean Energy Ventures | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,274 11,076 22,062 24,392
Operating Segments | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 16,021 20,312 60,705 65,500
Alternative revenue programs 0 0 0 0
Derivative instruments 54,151 287,503 527,979 1,024,204
Revenues out of scope 53,521 288,924 518,789 1,020,593
Total operating revenues 69,542 309,236 579,494 1,086,093
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 16,021 20,312 60,705 65,500
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 21,435 15,779 66,452 40,168
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 21,435 15,779 66,452 40,168
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 22,201 16,390 69,926 41,875
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 14,949 14,168 42,467 41,161
Home Services and Other | Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 14,949 14,168 42,467 41,161
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 14,949 14,168 42,467 41,161
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 8,842 8,428 26,242 25,387
Home Services and Other | Home Services and Other | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 6,113 5,792 16,427 16,006
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 (1,109) (1,001) (4,688) (2,952)
Revenues out of scope (630) 1,421 (9,190) (3,611)
Eliminations | Natural Gas Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (337) (338) (1,012) (1,013)
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 (630) 1,421 (9,190) (3,611)
Eliminations | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (766) (611) (3,474) (1,707)
Revenues out of scope 0 0 0 0
Eliminations | Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (6) (52) (202) (232)
Revenues out of scope $ 0 $ 0 $ 0 $ 0