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REVENUE - DISAGGREGATED REVENUE - PRODUCT (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 199,315 | $ 243,639 | $ 948,299 | $ 960,372
Alternative revenue programs | 5,211 | (1,810) | 29,016 | 11,348
Derivative instruments | 60,179 | 309,085 | 663,544 | 1,172,384
Revenues out of scope | 64,760 | 308,696 | 683,370 | 1,180,121
Total operating revenues | 264,075 | 552,335 | 1,631,669 | 2,140,493
Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 134,253 | 180,933 | 749,618 | 786,590
Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 38,222 | 36,702 | 130,631 | 107,375
Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,842 | 8,428 | 26,242 | 25,387
Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,113 | 5,792 | 16,427 | 16,006
Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,720 | 1,709 | 8,007 | 3,574
Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,274 | 11,076 | 22,062 | 24,392
Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 9,500 | 10,300 | 39,000 | 42,700
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 250,859 | 537,695 | 1,602,878 | 2,105,663
Operating Segments | Natural Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 133,916 | 180,595 | 748,606 | 785,577
Alternative revenue programs | 5,211 | (1,810) | 29,016 | 11,348
Derivative instruments | 5,844 | 20,572 | 125,258 | 140,341
Revenues out of scope | 11,055 | 18,762 | 154,274 | 151,689
Total operating revenues | 144,971 | 199,357 | 902,880 | 937,266
Operating Segments | Natural Gas Distribution | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 134,253 | 180,933 | 749,618 | 786,590
Operating Segments | Natural Gas Distribution | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Natural Gas Distribution | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,994 | 12,785 | 30,069 | 27,966
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 184 | 1,010 | 10,307 | 7,839
Revenues out of scope | 184 | 1,010 | 10,307 | 7,839
Total operating revenues | 13,178 | 13,795 | 40,376 | 35,805
Operating Segments | Clean Energy Ventures | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Clean Energy Ventures | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,720 | 1,709 | 8,007 | 3,574
Operating Segments | Clean Energy Ventures | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,274 | 11,076 | 22,062 | 24,392
Operating Segments | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,021 | 20,312 | 60,705 | 65,500
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 54,151 | 287,503 | 527,979 | 1,024,204
Revenues out of scope | 53,521 | 288,924 | 518,789 | 1,020,593
Total operating revenues | 69,542 | 309,236 | 579,494 | 1,086,093
Operating Segments | Energy Services | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Energy Services | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 16,021 | 20,312 | 60,705 | 65,500
Operating Segments | Energy Services | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Energy Services | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Energy Services | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Energy Services | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 21,435 | 15,779 | 66,452 | 40,168
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 21,435 | 15,779 | 66,452 | 40,168
Operating Segments | Storage and Transportation | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation | Natural gas services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 22,201 | 16,390 | 69,926 | 41,875
Operating Segments | Storage and Transportation | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Operating Segments | Storage and Transportation | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 14,949 | 14,168 | 42,467 | 41,161
Home Services and Other | Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 14,949 | 14,168 | 42,467 | 41,161
Alternative revenue programs | 0 | 0 | 0 | 0
Derivative instruments | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 14,949 | 14,168 | 42,467 | 41,161
Home Services and Other | Home Services and Other | Natural gas utility sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 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 | 0 | 0
Home Services and Other | Home Services and Other | Service contracts |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,842 | 8,428 | 26,242 | 25,387
Home Services and Other | Home Services and Other | Installations and maintenance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,113 | 5,792 | 16,427 | 16,006
Home Services and Other | Home Services and Other | Renewable energy certificates |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Home Services and Other | Home Services and Other | Electricity sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (1,109) | (1,001) | (4,688) | (2,952)
Revenues out of scope | (630) | 1,421 | (9,190) | (3,611)
Eliminations | Natural Gas Distribution |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (337) | (338) | (1,012) | (1,013)
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | Clean Energy Ventures |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Revenues out of scope | (630) | 1,421 | (9,190) | (3,611)
Eliminations | Storage and Transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (766) | (611) | (3,474) | (1,707)
Revenues out of scope | 0 | 0 | 0 | 0
Eliminations | Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | (6) | (52) | (202) | (232)
Revenues out of scope | $ 0 | $ 0 | $ 0 | $ 0

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