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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

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