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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 252,130 | $ 224,149
Revenues out of scope | 362,906 | 587,618
Total operating revenues | 615,036 | 811,767
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 167,961 | 147,539
Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 62,919 | 56,045
Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 19,589 | 18,934
Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 1,661 | 1,631
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 605,322 | 802,129
Home Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues out of scope | 0 | 0
Total operating revenues | 12,492 | 11,945
Home Services and Other | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 12,279 | 11,717
Home Services and Other | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 213 | 228
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 | 219,894 | 194,983
Revenues out of scope | (271) | 4,982
Total operating revenues | 219,623 | 199,965
Natural Gas Distribution | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 153,222 | 133,690
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 45,422 | 40,728
Natural Gas Distribution | Operating Segments | Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 19,589 | 18,934
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 1,661 | 1,631
Clean Energy Ventures | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 4,018 | 7,141
Revenues out of scope | 2,194 | 7,756
Total operating revenues | 6,212 | 14,897
Clean Energy Ventures | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 2,460 | 2,132
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 1,558 | 5,009
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 | 7,321 | 10,080
Revenues out of scope | 360,983 | 574,880
Total operating revenues | 368,304 | 584,960
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 | 7,321 | 10,080
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
Midstream | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 8,405 | 0
Revenues out of scope | 0 | 0
Total operating revenues | 8,405 | 0
Midstream | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Midstream | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 8,405 | 0
Midstream | Operating Segments | Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Midstream | Operating Segments | Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 0 | $ 0

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