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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | $ 1,198,985 | $ 852,105 | $ 833,677
Alternative revenue programs | 11,259 | (7,282) | 15,750
Derivative instruments | 1,695,829 | 1,311,364 | 1,105,357
Revenues out of scope | 1,706,994 | 1,304,508 | 1,119,991
Total operating revenues | 2,905,979 | 2,156,613 | 1,953,668
Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 951,626 | 694,635 | 695,858
Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 151,536 | 77,953 | 69,239
Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 33,932 | 33,250 | 32,455
Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 22,250 | 18,979 | 18,562
Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 5,487 | 4,571 | 1,384
Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 38,317 | 25,270 | 20,099
Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenues | 53,000 |  |
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenues | 2,854,054 | 2,106,511 | 1,907,687
Operating Segments | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 950,276 | 694,635 | 695,858
Alternative revenue programs | 11,259 | (7,282) | 15,750
Derivative instruments | 165,882 | 44,443 | 18,315
Revenues out of scope | 177,141 | 37,161 | 34,065
Total operating revenues | 1,127,417 | 731,796 | 729,923
Operating Segments | Natural Gas Distribution | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 951,626 | 694,635 | 695,858
Operating Segments | Natural Gas Distribution | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 43,804 | 29,841 | 21,483
Alternative revenue programs | 0 | 0 | 0
Derivative instruments | 84,476 | 65,434 | 81,134
Revenues out of scope | 84,476 | 65,434 | 81,134
Total operating revenues | 128,280 | 95,275 | 102,617
Operating Segments | Clean Energy Ventures | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 5,487 | 4,571 | 1,384
Operating Segments | Clean Energy Ventures | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 38,317 | 25,270 | 20,099
Operating Segments | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 83,801 | 26,933 | 24,511
Alternative revenue programs | 0 | 0 | 0
Derivative instruments | 1,445,471 | 1,201,487 | 1,005,908
Revenues out of scope | 1,445,377 | 1,201,913 | 1,004,792
Total operating revenues | 1,529,178 | 1,228,846 | 1,029,303
Operating Segments | Energy Services | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Energy Services | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 83,801 | 26,933 | 24,511
Operating Segments | Energy Services | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Energy Services | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Energy Services | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Energy Services | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Storage and Transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 65,286 | 49,252 | 42,015
Alternative revenue programs | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0
Total operating revenues | 65,286 | 49,252 | 42,015
Operating Segments | Storage and Transportation | Natural gas utility sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Storage and Transportation | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 67,735 | 51,020 | 44,728
Operating Segments | Storage and Transportation | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Storage and Transportation | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Storage and Transportation | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Operating Segments | Storage and Transportation | Electricity sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Home Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues out of scope | 0 | 0 | 0
Total operating revenues | 55,818 | 51,444 | 49,810
Home Services and Other | Home Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 55,818 | 51,444 | 49,810
Alternative revenue programs | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0
Total operating revenues | 55,818 | 51,444 | 49,810
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
Home Services and Other | Home Services and Other | Natural gas services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Home Services and Other | Home Services and Other | Service contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 33,932 | 33,250 | 32,455
Home Services and Other | Home Services and Other | Installations and maintenance |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 22,250 | 18,979 | 18,562
Home Services and Other | Home Services and Other | Renewable energy certificates |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 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
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | (4,163) | (2,553) | (3,920)
Revenues out of scope | (94) | 426 | (1,116)
Eliminations | Natural Gas Distribution |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | (1,350) | 0 | 0
Revenues out of scope | 0 | 0 | 0
Eliminations | Clean Energy Ventures |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0
Eliminations | Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Revenues out of scope | (94) | 426 | (1,116)
Eliminations | Storage and Transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | (2,449) | (1,768) | (2,713)
Revenues out of scope | 0 | 0 | 0
Eliminations | Home Services and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | (364) | (785) | (1,207)
Revenues out of scope | $ 0 | $ 0 | $ 0

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