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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 157,024 | $ 136,773 | $ 712,554 | $ 678,077
Revenues out of scope | 141,950 | 298,169 | 841,070 | 1,434,887
Total operating revenues | 298,974 | 434,942 | 1,553,624 | 2,112,964
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 103,527 | 78,676 | 485,564 | 444,341
Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 37,754 | 44,067 | 164,540 | 176,943
Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 14,331 | 12,296 | 58,043 | 52,006
Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,412 | 1,734 | 4,407 | 4,787
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 287,334 | 422,253 | 1,520,648 | 2,084,987
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 12,163 | 12,627 | 36,694 | 36,253
Home Services and Other | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,845 | 12,388 | 35,955 | 35,522
Home Services and Other | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 318 | 239 | 739 | 731
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 | 124,888 | 115,525 | 611,650 | 598,676
Revenues out of scope | 3,644 | 5,257 | 33,725 | 23,491
Total operating revenues | 128,532 | 120,782 | 645,375 | 622,167
Natural Gas Distribution | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 89,095 | 63,984 | 442,093 | 402,192
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 20,050 | 37,511 | 107,107 | 139,691
Natural Gas Distribution | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 14,331 | 12,296 | 58,043 | 52,006
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,412 | 1,734 | 4,407 | 4,787
Clean Energy Ventures | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 5,294 | 4,745 | 13,770 | 16,944
Revenues out of scope | 8,102 | 6,705 | 11,833 | 20,763
Total operating revenues | 13,396 | 11,450 | 25,603 | 37,707
Clean Energy Ventures | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,587 | 2,304 | 7,516 | 6,627
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,707 | 2,441 | 6,254 | 10,317
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 | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,536 | 3,876 | 20,491 | 26,204
Revenues out of scope | 130,204 | 286,207 | 795,512 | 1,390,633
Total operating revenues | 133,740 | 290,083 | 816,003 | 1,416,837
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 | 3,536 | 3,876 | 20,491 | 26,204
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
Midstream | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,143 | 0 | 29,949 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 11,143 | 0 | 29,949 | 0
Midstream | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Midstream | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,143 | 0 | 29,949 | 0
Midstream | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Midstream | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 0 | $ 0 | $ 0 | $ 0

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