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REVENUE - DISAGGREGATED REVENUE - TYPE (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | $ 155,392 | $ 157,024 | $ 720,495 | $ 712,554
Revenues out of scope | 212,201 | 141,950 | 903,590 | 841,070
Total operating revenues | 367,593 | 298,974 | 1,624,085 | 1,553,624
Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 94,835 | 103,527 | 487,085 | 485,564
Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 44,615 | 37,754 | 165,667 | 164,540
Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 15,052 | 14,331 | 64,346 | 58,043
Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 890 | 1,412 | 3,397 | 4,407
Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total operating revenues | 354,250 | 287,334 | 1,592,068 | 1,520,648
Home Services and Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 13,071 | 12,163 | 38,002 | 36,694
Home Services and Other | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 12,877 | 11,845 | 37,315 | 35,955
Home Services and Other | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 194 | 318 | 687 | 739
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 | 118,367 | 124,888 | 604,619 | 611,650
Revenues out of scope | 9,259 | 3,644 | 28,903 | 33,725
Total operating revenues | 127,626 | 128,532 | 633,522 | 645,375
Natural Gas Distribution | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 79,054 | 89,095 | 441,452 | 442,093
Natural Gas Distribution | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 23,371 | 20,050 | 95,424 | 107,107
Natural Gas Distribution | Operating Segments | Firm transportation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 15,052 | 14,331 | 64,346 | 58,043
Natural Gas Distribution | Operating Segments | Interruptible and off-tariff |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 890 | 1,412 | 3,397 | 4,407
Clean Energy Ventures | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 8,914 | 5,294 | 19,691 | 13,770
Revenues out of scope | 4,467 | 8,102 | 6,536 | 11,833
Total operating revenues | 13,381 | 13,396 | 26,227 | 25,603
Clean Energy Ventures | Operating Segments | Residential |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 2,904 | 2,587 | 8,318 | 7,516
Clean Energy Ventures | Operating Segments | Commercial and industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 6,010 | 2,707 | 11,373 | 6,254
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 | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from contracts with customers | 4,041 | 3,536 | 21,480 | 20,491
Revenues out of scope | 198,475 | 130,204 | 868,151 | 795,512
Total operating revenues | 202,516 | 133,740 | 889,631 | 816,003
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 | 4,041 | 3,536 | 21,480 | 20,491
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 | 10,999 | 11,143 | 36,703 | 29,949
Revenues out of scope | 0 | 0 | 0 | 0
Total operating revenues | 10,999 | 11,143 | 36,703 | 29,949
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 | 10,999 | 11,143 | 36,703 | 29,949
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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