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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  | $ 729,923 | $ 710,793 | $ 731,865
Nonutility |  |  |  |  |  |  |  |  | 1,223,745 | 1,881,252 | 2,183,244
Total operating revenues | $ 400,044 | $ 298,974 | $ 639,614 | $ 615,036 | $ 479,081 | $ 434,942 | $ 866,255 | $ 811,767 | 1,953,668 | 2,592,045 | 2,915,109
Depreciation and amortization |  |  |  |  |  |  |  |  | 119,894 | 91,730 | 85,701
Interest income |  |  |  |  |  |  |  |  | 2,959 | 1,623 | 614
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 67,597 | 47,082 | 46,286
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (6,944) | (37,751) | (53,785)
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 14,311 | 13,628 | 13,008
Net financial earnings (loss) |  |  |  |  |  |  |  |  | 196,245 | 174,960 | 240,486
Capital expenditures |  |  |  |  |  |  |  |  | 448,109 | 525,932 | 384,588
Investments in equity investees |  |  |  |  |  |  |  |  | 2,117 | 4,102 | 16,151
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 1,907,687 | 2,551,683 | 2,916,044
Depreciation and amortization |  |  |  |  |  |  |  |  | 119,154 | 91,101 | 85,167
Interest income |  |  |  |  |  |  |  |  | 4,387 | 5,072 | 4,228
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 67,628 | 48,370 | 49,231
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (4,751) | (38,806) | (65,394)
Net financial earnings (loss) |  |  |  |  |  |  |  |  | 190,363 | 173,142 | 244,642
Capital expenditures |  |  |  |  |  |  |  |  | 444,879 | 523,448 | 383,375
Operating Segments | Natural Gas Distribution |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  | 729,923 | 710,793 | 731,865
Total operating revenues |  |  |  |  |  |  |  |  | 729,923 | 710,793 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 71,883 | 57,980 | 53,208
Interest income |  |  |  |  |  |  |  |  | 538 | 994 | 614
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 30,975 | 26,134 | 25,299
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 27,021 | 9,434 | (1,910)
Net financial earnings (loss) |  |  |  |  |  |  |  |  | 126,902 | 78,062 | 84,048
Capital expenditures |  |  |  |  |  |  |  |  | 290,040 | 345,004 | 254,523
Operating Segments | Clean Energy Ventures |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 102,617 | 98,099 | 71,375
Total operating revenues |  |  |  |  |  |  |  |  | 102,617 | 98,099 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 37,855 | 32,997 | 31,877
Interest income |  |  |  |  |  |  |  |  | 240 | 0 | 0
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 20,253 | 14,846 | 18,320
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (32,404) | (48,921) | (79,932)
Net financial earnings (loss) |  |  |  |  |  |  |  |  | 53,023 | 77,473 | 75,849
Capital expenditures |  |  |  |  |  |  |  |  | 133,841 | 157,828 | 123,421
Operating Segments | Energy Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 1,029,303 | 1,734,553 | 2,064,477
Total operating revenues |  |  |  |  |  |  |  |  | 1,029,303 | 1,734,553 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 123 | 118 | 76
Interest income |  |  |  |  |  |  |  |  | 99 | 78 | 240
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 3,276 | 5,205 | 3,945
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (3,615) | (1,573) | 24,996
Net financial earnings (loss) |  |  |  |  |  |  |  |  | (7,873) | 2,918 | 60,378
Operating Segments | Storage and Transportation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 42,015 | 0 | 0
Total operating revenues |  |  |  |  |  |  |  |  | 42,015 | 0 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,293 | 6 | 6
Interest income |  |  |  |  |  |  |  |  | 3,510 | 4,000 | 3,374
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 13,124 | 2,185 | 1,667
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 4,247 | 2,254 | (8,548)
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 15,903 | 15,832 | 16,165
Net financial earnings (loss) |  |  |  |  |  |  |  |  | 18,311 | 14,689 | 24,367
Capital expenditures |  |  |  |  |  |  |  |  | 20,998 | 20,616 | 5,431
Investments in equity investees |  |  |  |  |  |  |  |  | 2,117 | 4,102 | 16,151
Intercompany |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 1,207 | 2,302 | 2,665
Intercompany | Energy Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 1,116 | 8,238 | 48,327
Intercompany | Storage and Transportation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 2,713 | 0 | 0
Home Services and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 49,810 | 48,600 | 47,392
Total operating revenues |  |  |  |  |  |  |  |  | 49,810 | 48,600 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,032 | 914 | 780
Interest income |  |  |  |  |  |  |  |  | 8,633 | 1,942 | 1,476
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 10,327 | 1,535 | 7
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (2,478) | 1,428 | 11,944
Net financial earnings (loss) |  |  |  |  |  |  |  |  | 5,784 | 1,911 | (3,829)
Capital expenditures |  |  |  |  |  |  |  |  | 3,230 | 2,484 | 1,213
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | (5,036) | (10,540) | (50,992)
Depreciation and amortization |  |  |  |  |  |  |  |  | (292) | (285) | (246)
Interest income |  |  |  |  |  |  |  |  | (10,061) | (5,391) | (5,090)
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | (10,358) | (2,823) | (2,952)
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 285 | (373) | (335)
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | (1,592) | (2,204) | (3,157)
Net financial earnings (loss) |  |  |  |  |  |  |  |  | $ 98 | $ (93) | $ (327)

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