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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | $ 833,677 | $ 782,331 |
Revenues out of scope |  |  |  |  |  |  |  |  | 1,119,991 | 1,809,714 |
Total operating revenues | $ 400,044 | $ 298,974 | $ 639,614 | $ 615,036 | $ 479,081 | $ 434,942 | $ 866,255 | $ 811,767 | 1,953,668 | 2,592,045 | $ 2,915,109
Residential |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 549,333 | 497,445 |
Commercial and industrial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 208,665 | 216,879 |
Firm transportation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 69,357 | 61,370 |
Interruptible and off-tariff |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 6,322 | 6,637 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 1,907,687 | 2,551,683 | $ 2,916,044
Home Services and Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues out of scope |  |  |  |  |  |  |  |  | 0 | 0 |
Total operating revenues |  |  |  |  |  |  |  |  | 49,810 | 48,600 |
Home Services and Other | Residential |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 48,867 | 47,655 |
Home Services and Other | Commercial and industrial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 943 | 945 |
Home Services and Other | Firm transportation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Home Services and Other | Interruptible and off-tariff |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Natural Gas Distribution | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 695,858 | 680,151 |
Revenues out of scope |  |  |  |  |  |  |  |  | 34,065 | 30,642 |
Total operating revenues |  |  |  |  |  |  |  |  | 729,923 | 710,793 |
Natural Gas Distribution | Operating Segments | Residential |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 490,233 | 440,787 |
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 129,946 | 171,357 |
Natural Gas Distribution | Operating Segments | Firm transportation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 69,357 | 61,370 |
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 6,322 | 6,637 |
Clean Energy Ventures | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 21,483 | 22,121 |
Revenues out of scope |  |  |  |  |  |  |  |  | 81,134 | 75,978 |
Total operating revenues |  |  |  |  |  |  |  |  | 102,617 | 98,099 |
Clean Energy Ventures | Operating Segments | Residential |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 10,233 | 9,003 |
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 11,250 | 13,118 |
Clean Energy Ventures | Operating Segments | Firm transportation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Clean Energy Ventures | Operating Segments | Interruptible and off-tariff |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Energy Services | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 24,511 | 31,459 |
Revenues out of scope |  |  |  |  |  |  |  |  | 1,004,792 | 1,703,094 |
Total operating revenues |  |  |  |  |  |  |  |  | 1,029,303 | 1,734,553 |
Energy Services | Operating Segments | Residential |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Energy Services | Operating Segments | Commercial and industrial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 24,511 | 31,459 |
Energy Services | Operating Segments | Firm transportation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Energy Services | Operating Segments | Interruptible and off-tariff |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Storage and Transportation | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 42,015 | 0 |
Revenues out of scope |  |  |  |  |  |  |  |  | 0 | 0 |
Total operating revenues |  |  |  |  |  |  |  |  | 42,015 | 0 |
Storage and Transportation | Operating Segments | Residential |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Storage and Transportation | Operating Segments | Commercial and industrial |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 42,015 | 0 |
Storage and Transportation | Operating Segments | Firm transportation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | 0 | 0 |
Storage and Transportation | Operating Segments | Interruptible and off-tariff |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from contracts with customers |  |  |  |  |  |  |  |  | $ 0 | $ 0 |

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