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REVENUE - DISAGGREGATED REVENUE - PRODUCT (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
Alternative revenue programs | 10,654 | 1,568
Derivative instruments | 384,554 | 229,138
Revenues out of scope | 391,752 | 228,578
Total operating revenues | 675,842 | 454,305
Natural gas utility sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 223,796 | 189,364
Natural gas services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 40,022 | 19,532
Service contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 8,467 | 8,259
Installations and maintenance |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 5,484 | 4,318
Renewable energy certificates |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 846 | 690
Electricity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 6,470 | 4,388
Energy Services |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 22,100 |
Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Total operating revenues | 666,342 | 444,680
Operating Segments | Natural Gas Distribution |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 223,459 | 189,364
Alternative revenue programs | 10,654 | 1,568
Derivative instruments | 40,322 | 4,797
Revenues out of scope | 50,976 | 6,365
Total operating revenues | 274,435 | 195,729
Operating Segments | Natural Gas Distribution | Natural gas utility sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 223,796 | 189,364
Operating Segments | Natural Gas Distribution | Natural gas services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Natural Gas Distribution | Service contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Natural Gas Distribution | Installations and maintenance |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Natural Gas Distribution | Renewable energy certificates |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Natural Gas Distribution | Electricity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Clean Energy Ventures |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 7,316 | 5,078
Alternative revenue programs | 0 | 0
Derivative instruments | 2,867 | 1,292
Revenues out of scope | 2,867 | 1,292
Total operating revenues | 10,183 | 6,370
Operating Segments | Clean Energy Ventures | Natural gas utility sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Clean Energy Ventures | Natural gas services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Clean Energy Ventures | Service contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Clean Energy Ventures | Installations and maintenance |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Clean Energy Ventures | Renewable energy certificates |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 846 | 690
Operating Segments | Clean Energy Ventures | Electricity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 6,470 | 4,388
Operating Segments | Energy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 27,879 | 6,428
Alternative revenue programs | 0 | 0
Derivative instruments | 341,365 | 223,049
Revenues out of scope | 337,909 | 220,921
Total operating revenues | 365,788 | 227,349
Operating Segments | Energy Services | Natural gas utility sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Energy Services | Natural gas services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 27,879 | 6,428
Operating Segments | Energy Services | Service contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Energy Services | Installations and maintenance |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Energy Services | Renewable energy certificates |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Energy Services | Electricity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Storage and Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 11,584 | 12,447
Alternative revenue programs | 0 | 0
Derivative instruments | 0 | 0
Revenues out of scope | 0 | 0
Total operating revenues | 11,584 | 12,447
Operating Segments | Storage and Transportation | Natural gas utility sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Storage and Transportation | Natural gas services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 12,143 | 13,104
Operating Segments | Storage and Transportation | Service contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Storage and Transportation | Installations and maintenance |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Storage and Transportation | Renewable energy certificates |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Operating Segments | Storage and Transportation | Electricity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
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 | Home Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 13,852 | 12,410
Alternative revenue programs | 0 | 0
Derivative instruments | 0 | 0
Revenues out of scope | 0 | 0
Total operating revenues | 13,852 | 12,410
Home Services and Other | Home Services and Other | Natural gas utility sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Home Services and Other | Home Services and Other | Natural gas services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Home Services and Other | Home Services and Other | Service contracts |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 8,467 | 8,259
Home Services and Other | Home Services and Other | Installations and maintenance |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 5,484 | 4,318
Home Services and Other | Home Services and Other | Renewable energy certificates |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Home Services and Other | Home Services and Other | Electricity sales |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | (995) | (824)
Revenues out of scope | (3,456) | (2,128)
Eliminations | Natural Gas Distribution |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | (337) | 0
Revenues out of scope | 0 | 0
Eliminations | Clean Energy Ventures |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Revenues out of scope | 0 | 0
Eliminations | Energy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | 0 | 0
Revenues out of scope | (3,456) | (2,128)
Eliminations | Storage and Transportation |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | (559) | (657)
Revenues out of scope | 0 | 0
Eliminations | Home Services and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues from contracts with customers | (99) | (167)
Revenues out of scope | $ 0 | $ 0

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