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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | $ 364,551 | $ 284,090
Revenues out of scope | 359,016 | 391,752
Total operating revenues | 723,567 | 675,842
Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 234,411 | 168,055
Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 103,043 | 91,068
Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 26,199 | 22,675
Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 898 | 2,292
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 719,158 | 666,342
Home Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues out of scope | 0 | 0
Total operating revenues | 14,253 | 13,852
Home Services and Other | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 14,180 | 13,775
Home Services and Other | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 73 | 77
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 | 287,830 | 223,459
Revenues out of scope | 69,579 | 50,976
Total operating revenues | 357,409 | 274,435
Natural Gas Distribution | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 216,938 | 151,308
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 43,795 | 47,184
Natural Gas Distribution | Operating Segments | Firm transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 26,199 | 22,675
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 898 | 2,292
Clean Energy Ventures | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 8,906 | 7,316
Revenues out of scope | 3,886 | 2,867
Total operating revenues | 12,792 | 10,183
Clean Energy Ventures | Operating Segments | Residential |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 3,293 | 2,972
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 5,613 | 4,344
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 | 20,000 | 22,100
Energy Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 27,848 | 27,879
Revenues out of scope | 285,551 | 337,909
Total operating revenues | 313,399 | 365,788
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 | 27,848 | 27,879
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 | 25,714 | 11,584
Revenues out of scope | 0 | 0
Total operating revenues | 25,714 | 11,584
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 | 25,714 | 11,584
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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