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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 339,376 $ 303,400 $ 565,103 $ 555,530
Alternative revenue programs (6,664) 22,073 (5,096) 20,130
Derivative instruments 472,278 313,883 24,740 680,843
Revenues out of scope 462,811 336,214 691,389 699,120
Total operating revenues 802,187 639,614 1,256,492 1,254,650
Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 296,888 266,868 486,252 486,762
Natural gas services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 24,937 20,710 44,469 37,103
Service contracts        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 8,314 8,073 16,573 16,111
Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,459 4,292 8,777 9,161
Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 817   1,507  
Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,882 4,458 9,270 8,476
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenues 793,138 627,992 1,237,818 1,233,314
Operating Segments | Natural Gas Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 296,888 266,868 486,252 486,762
Alternative revenue programs (6,664) 22,073 (5,096) 20,130
Derivative instruments 19,943 8,279 24,740 9,951
Revenues out of scope 13,279 30,352 19,644 30,081
Total operating revenues 310,167 297,220 505,896 516,843
Operating Segments | Natural Gas Distribution | Natural gas utility sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 296,888 266,868 486,252 486,762
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  
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 5,699 4,458 10,777 8,476
Alternative revenue programs 0 0 0 0
Derivative instruments 777 1,537 2,069 3,731
Revenues out of scope 777 1,537 2,069 3,731
Total operating revenues 6,476 5,995 12,846 12,207
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 817   1,507  
Operating Segments | Clean Energy Ventures | Electricity sales        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,882 4,458 9,270 8,476
Operating Segments | Energy Services        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 11,011 9,634 17,439 16,955
Alternative revenue programs 0 0 0 0
Derivative instruments 451,558 304,067 674,607 667,161
Revenues out of scope 448,755 304,325 669,676 665,308
Total operating revenues 459,766 313,959 687,115 682,263
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 11,011 9,634 17,439 16,955
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  
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 13,257 10,401 25,704 18,806
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 13,257 10,401 25,704 18,806
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 13,926 11,076 27,030 20,148
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  
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 12,521 12,039 24,931 24,531
Home Services and Other | Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 12,521 12,039 24,931 24,531
Alternative revenue programs 0 0 0 0
Derivative instruments 0 0 0 0
Revenues out of scope 0 0 0 0
Total operating revenues 12,521 12,039 24,931 24,531
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 8,314 8,073 16,573 16,111
Home Services and Other | Home Services and Other | Installations and maintenance        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 4,459 4,292 8,777 9,161
Home Services and Other | Home Services and Other | Renewable energy certificates        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 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 (921) (1,001) (1,745) (2,083)
Revenues out of scope (2,803) 258 (4,931) (1,853)
Eliminations | Natural Gas Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 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 (2,803) 258 (4,931) (1,853)
Eliminations | Storage and Transportation        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (669) (675) (1,326) (1,342)
Revenues out of scope 0 0 0 0
Eliminations | Home Services and Other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers (252) (326) (419) (741)
Revenues out of scope $ 0 $ 0 $ 0 $ 0