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REVENUE - DISAGGREGATED REVENUE - TYPE (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
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
Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 654,886 | 549,026 | 549,333
Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 446,471 | 219,981 | 208,665
Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 92,531 | 79,256 | 69,357
Interruptible and off-tariff |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 5,097 | 3,842 | 6,322
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenues | 2,854,054 | 2,106,511 | 1,907,687
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 | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 55,629 | 50,689 | 48,867
Home Services and Other | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 189 | 755 | 943
Home Services and Other | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Home Services and Other | Interruptible and off-tariff |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Natural Gas Distribution | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 950,276 | 694,635 | 695,858
Revenues out of scope | 177,141 | 37,161 | 34,065
Total operating revenues | 1,127,417 | 731,796 | 729,923
Natural Gas Distribution | Operating Segments | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 586,678 | 487,018 | 490,233
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 265,970 | 124,519 | 129,946
Natural Gas Distribution | Operating Segments | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 92,531 | 79,256 | 69,357
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 5,097 | 3,842 | 6,322
Clean Energy Ventures | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 43,804 | 29,841 | 21,483
Revenues out of scope | 84,476 | 65,434 | 81,134
Total operating revenues | 128,280 | 95,275 | 102,617
Clean Energy Ventures | Operating Segments | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 12,579 | 11,319 | 10,233
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 31,225 | 18,522 | 11,250
Clean Energy Ventures | Operating Segments | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Clean Energy Ventures | Operating Segments | Interruptible and off-tariff |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Energy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total operating revenues | 53,000 |  |
Energy Services | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 83,801 | 26,933 | 24,511
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
Energy Services | Operating Segments | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Energy Services | Operating Segments | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 83,801 | 26,933 | 24,511
Energy Services | Operating Segments | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Energy Services | Operating Segments | Interruptible and off-tariff |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Storage and Transportation | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 65,286 | 49,252 | 42,015
Revenues out of scope | 0 | 0 | 0
Total operating revenues | 65,286 | 49,252 | 42,015
Storage and Transportation | Operating Segments | Residential |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Storage and Transportation | Operating Segments | Commercial and industrial |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 65,286 | 49,252 | 42,015
Storage and Transportation | Operating Segments | Firm transportation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | 0 | 0 | 0
Storage and Transportation | Operating Segments | Interruptible and off-tariff |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues from contracts with customers | $ 0 | $ 0 | $ 0

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