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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 303,400 | $ 317,155 | $ 555,530 | $ 541,304
Revenues out of scope | 336,214 | 549,100 | 699,120 | 1,136,718
Total operating revenues | 639,614 | 866,255 | 1,254,650 | 1,678,022
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 214,076 | 218,126 | 382,037 | 365,665
Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 63,867 | 76,831 | 126,786 | 132,876
Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 24,123 | 20,776 | 43,712 | 39,710
Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,334 | 1,422 | 2,995 | 3,053
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 627,992 | 860,605 | 1,233,314 | 1,662,734
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 12,039 | 11,681 | 24,531 | 23,626
Home Services and Other | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 11,831 | 11,417 | 24,110 | 23,134
Home Services and Other | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 208 | 264 | 421 | 492
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 | 266,868 | 288,168 | 486,762 | 483,151
Revenues out of scope | 30,352 | 13,252 | 30,081 | 18,234
Total operating revenues | 297,220 | 301,420 | 516,843 | 501,385
Natural Gas Distribution | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 199,776 | 204,518 | 352,998 | 338,208
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 41,635 | 61,452 | 87,057 | 102,180
Natural Gas Distribution | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 24,123 | 20,776 | 43,712 | 39,710
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,334 | 1,422 | 2,995 | 3,053
Clean Energy Ventures | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,458 | 5,058 | 8,476 | 12,199
Revenues out of scope | 1,537 | 6,302 | 3,731 | 14,058
Total operating revenues | 5,995 | 11,360 | 12,207 | 26,257
Clean Energy Ventures | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,469 | 2,191 | 4,929 | 4,323
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,989 | 2,867 | 3,547 | 7,876
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 | 9,634 | 12,248 | 16,955 | 22,328
Revenues out of scope | 304,325 | 529,546 | 665,308 | 1,104,426
Total operating revenues | 313,959 | 541,794 | 682,263 | 1,126,754
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 | 9,634 | 12,248 | 16,955 | 22,328
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 | 10,401 | 0 | 18,806 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 10,401 | 0 | 18,806 | 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 | 10,401 | 0 | 18,806 | 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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