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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 136,773 |  | $ 678,077 |
Revenues out of scope | 298,169 |  | 1,434,887 |
Total operating revenues | 434,942 | $ 543,435 | 2,112,964 | $ 2,267,783
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 78,676 |  | 444,341 |
Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 44,067 |  | 176,943 |
Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,296 |  | 52,006 |
Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,734 |  | 4,787 |
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 422,253 | 529,291 | 2,084,987 | $ 2,286,298
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers |  | $ 13,100 | 37,900 |
Unregulated | Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,627 |  | 36,253 |
Revenues out of scope | 0 |  | 0 |
Total operating revenues | 12,627 |  | 36,253 |
Unregulated | Home Services and Other | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,388 |  | 35,522 |
Unregulated | Home Services and Other | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 239 |  | 731 |
Unregulated | Home Services and Other | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Unregulated | Home Services and Other | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Natural Gas Distribution | Regulated | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 115,525 |  | 598,676 |
Revenues out of scope | 5,257 |  | 23,491 |
Total operating revenues | 120,782 |  | 622,167 |
Natural Gas Distribution | Regulated | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 63,984 |  | 402,192 |
Natural Gas Distribution | Regulated | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 37,511 |  | 139,691 |
Natural Gas Distribution | Regulated | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,296 |  | 52,006 |
Natural Gas Distribution | Regulated | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 1,734 |  | 4,787 |
Clean Energy Ventures | Unregulated | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,745 |  | 16,944 |
Revenues out of scope | 6,705 |  | 20,763 |
Total operating revenues | 11,450 |  | 37,707 |
Clean Energy Ventures | Unregulated | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,304 |  | 6,627 |
Clean Energy Ventures | Unregulated | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,441 |  | 10,317 |
Clean Energy Ventures | Unregulated | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Clean Energy Ventures | Unregulated | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Energy Services | Unregulated | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,876 |  | 26,204 |
Revenues out of scope | 286,207 |  | 1,390,633 |
Total operating revenues | 290,083 |  | 1,416,837 |
Energy Services | Unregulated | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Energy Services | Unregulated | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 3,876 |  | 26,204 |
Energy Services | Unregulated | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 |  | 0 |
Energy Services | Unregulated | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 0 |  | $ 0 |

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