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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 432,643 | $ 339,376 | $ 716,733 | $ 565,103
Revenues out of scope | 479,673 | 462,811 | 871,425 | 691,389
Total operating revenues | 912,316 | 802,187 | 1,588,158 | 1,256,492
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 302,301 | 240,100 | 470,356 | 392,250
Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 95,130 | 70,386 | 186,198 | 121,052
Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 34,636 | 28,190 | 57,311 | 49,294
Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 576 | 700 | 2,868 | 2,507
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 901,626 | 793,138 | 1,567,968 | 1,237,818
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 13,141 | 12,521 | 26,993 | 24,931
Home Services and Other | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 13,105 | 12,234 | 26,880 | 24,438
Home Services and Other | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 36 | 287 | 113 | 493
Home Services and Other | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Home Services and Other | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Natural Gas Distribution | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 381,523 | 296,888 | 604,982 | 486,252
Revenues out of scope | 81,951 | 13,279 | 132,927 | 19,644
Total operating revenues | 463,474 | 310,167 | 737,909 | 505,896
Natural Gas Distribution | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 286,205 | 225,174 | 437,513 | 362,398
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 60,106 | 42,824 | 107,290 | 72,053
Natural Gas Distribution | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 34,636 | 28,190 | 57,311 | 49,294
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 576 | 700 | 2,868 | 2,507
Clean Energy Ventures | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 7,865 | 5,699 | 15,181 | 10,777
Revenues out of scope | 3,962 | 777 | 6,829 | 2,069
Total operating revenues | 11,827 | 6,476 | 22,010 | 12,846
Clean Energy Ventures | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,991 | 2,692 | 5,963 | 5,414
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,874 | 3,007 | 9,218 | 5,363
Clean Energy Ventures | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Clean Energy Ventures | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Energy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 10,300 |  | 32,400 |
Energy Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 17,309 | 11,011 | 45,188 | 17,439
Revenues out of scope | 393,760 | 448,755 | 731,669 | 669,676
Total operating revenues | 411,069 | 459,766 | 776,857 | 687,115
Energy Services | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Energy Services | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 17,309 | 11,011 | 45,188 | 17,439
Energy Services | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Energy Services | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Storage and Transportation | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,805 | 13,257 | 24,389 | 25,704
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 12,805 | 13,257 | 24,389 | 25,704
Storage and Transportation | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Storage and Transportation | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,805 | 13,257 | 24,389 | 25,704
Storage and Transportation | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 0 | 0 | 0 | 0
Storage and Transportation | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 0 | $ 0 | $ 0 | $ 0

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