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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 284,090 | $ 225,727
Revenues out of scope | 391,752 | 228,578
Total operating revenues | 675,842 | 454,305
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 168,055 | 152,150
Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 91,068 | 50,666
Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 22,675 | 21,104
Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 2,292 | 1,807
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 666,342 | 444,680
Home Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues out of scope | 0 | 0
Total operating revenues | 13,852 | 12,410
Home Services and Other | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 13,775 | 12,204
Home Services and Other | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 77 | 206
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 | 223,459 | 189,364
Revenues out of scope | 50,976 | 6,365
Total operating revenues | 274,435 | 195,729
Natural Gas Distribution | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 151,308 | 137,224
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 47,184 | 29,229
Natural Gas Distribution | Operating Segments | Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 22,675 | 21,104
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 2,292 | 1,807
Clean Energy Ventures | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 7,316 | 5,078
Revenues out of scope | 2,867 | 1,292
Total operating revenues | 10,183 | 6,370
Clean Energy Ventures | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 2,972 | 2,722
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 4,344 | 2,356
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 |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 22,100 |
Energy Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 27,879 | 6,428
Revenues out of scope | 337,909 | 220,921
Total operating revenues | 365,788 | 227,349
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 | 27,879 | 6,428
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 | 11,584 | 12,447
Revenues out of scope | 0 | 0
Total operating revenues | 11,584 | 12,447
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 | 11,584 | 12,447
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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