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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 384,433 | $ 432,643 | $ 748,984 | $ 716,733
Revenues out of scope | 259,594 | 479,673 | 618,610 | 871,425
Total operating revenues | 644,027 | 912,316 | 1,367,594 | 1,588,158
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 263,916 | 302,301 | 498,327 | 470,356
Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 90,385 | 95,130 | 193,428 | 186,198
Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 29,368 | 34,636 | 55,567 | 57,311
Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 764 | 576 | 1,662 | 2,868
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 632,861 | 901,626 | 1,352,019 | 1,567,968
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 13,265 | 13,141 | 27,518 | 26,993
Home Services and Other | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 13,089 | 13,105 | 27,269 | 26,880
Home Services and Other | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 176 | 36 | 249 | 113
Home Services and Other | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Home Services and Other | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Natural Gas Distribution | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 326,860 | 381,523 | 614,690 | 604,982
Revenues out of scope | 73,640 | 81,951 | 143,219 | 132,927
Total operating revenues | 400,500 | 463,474 | 757,909 | 737,909
Natural Gas Distribution | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 247,623 | 286,205 | 464,561 | 437,513
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 49,105 | 60,106 | 92,900 | 107,290
Natural Gas Distribution | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 29,368 | 34,636 | 55,567 | 57,311
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 764 | 576 | 1,662 | 2,868
Clean Energy Ventures | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,169 | 7,865 | 17,075 | 15,181
Revenues out of scope | 6,237 | 3,962 | 10,123 | 6,829
Total operating revenues | 14,406 | 11,827 | 27,198 | 22,010
Clean Energy Ventures | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,204 | 2,991 | 6,497 | 5,963
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,965 | 4,874 | 10,578 | 9,218
Clean Energy Ventures | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 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 | 0
Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 9,500 | 10,300 | 29,500 | 32,400
Energy Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,836 | 17,309 | 44,684 | 45,188
Revenues out of scope | 179,717 | 393,760 | 465,268 | 731,669
Total operating revenues | 196,553 | 411,069 | 509,952 | 776,857
Energy Services | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Energy Services | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,836 | 17,309 | 44,684 | 45,188
Energy Services | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Energy Services | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Storage and Transportation | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 19,303 | 12,805 | 45,017 | 24,389
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 19,303 | 12,805 | 45,017 | 24,389
Storage and Transportation | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Storage and Transportation | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 19,303 | 12,805 | 45,017 | 24,389
Storage and Transportation | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 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 | $ 0

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