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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |
Utility | $ 1,127,417 | $ 731,459 | $ 729,923
Nonutility | 1,778,562 | 1,425,154 | 1,223,745
Operating revenues | 2,905,979 | 2,156,613 | 1,953,668
Depreciation and amortization | 129,249 | 111,387 | 107,368
Interest income | 2,716 | 2,167 | 2,959
Interest expense, net of capitalized interest | 85,830 | 78,559 | 67,597
Income tax provision (benefit) | 76,195 | 33,286 | 36,494
Equity in earnings (loss) of affiliates | 8,177 | (83,212) | 14,311
Net financial earnings (loss) | 240,321 | 207,712 | 165,333
Capital expenditures | 598,428 | 624,610 | 448,109
(Return of capital from) investments in equity investees | (5,479) |  |
(Return of capital from) investments in equity investees |  | 690 | 2,117
Energy Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 53,000 |  |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 2,854,054 | 2,106,511 | 1,907,687
Depreciation and amortization | 128,425 | 110,683 | 106,628
Interest income | 3,021 | 2,580 | 4,387
Interest expense, net of capitalized interest | 85,184 | 74,505 | 67,628
Income tax provision (benefit) | 75,157 | 32,430 | 38,687
Net financial earnings (loss) | 241,102 | 208,327 | 159,451
Capital expenditures | 597,038 | 621,980 | 444,879
Operating Segments | Natural Gas Distribution, External Customers |  |  |
Segment Reporting Information [Line Items] |  |  |
Utility | 1,127,417 | 731,796 | 729,923
Operating Segments | Clean Energy Ventures, External Customers |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 128,280 | 95,275 | 102,617
Operating Segments | Energy Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 1,529,178 | 1,228,846 | 1,029,303
Operating revenues | 1,529,178 | 1,228,846 | 1,029,303
Depreciation and amortization | 148 | 111 | 123
Interest income | 16 | 11 | 99
Interest expense, net of capitalized interest | 4,725 | 2,204 | 3,276
Income tax provision (benefit) | 21,776 | 18,371 | (3,615)
Net financial earnings (loss) | 39,121 | 71,117 | (7,873)
Operating Segments | Energy Services | CANADA |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 2,400 | 75 | 584
Operating Segments | Storage and Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 65,286 | 49,252 | 42,015
Operating revenues | 65,286 | 49,252 | 42,015
Depreciation and amortization | 12,302 | 9,960 | 9,293
Interest income | 2,110 | 2,243 | 3,510
Interest expense, net of capitalized interest | 12,097 | 13,348 | 13,124
Income tax provision (benefit) | 1,879 | (10,043) | 4,247
Equity in earnings (loss) of affiliates | 9,865 | (81,072) | 15,903
Net financial earnings (loss) | 22,454 | 13,046 | 18,311
Capital expenditures | 151,988 | 107,500 | 20,998
(Return of capital from) investments in equity investees | (5,479) |  |
(Return of capital from) investments in equity investees |  | 690 | 2,117
Operating Segments | Natural Gas Distribution |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 1,127,417 | 731,796 | 729,923
Depreciation and amortization | 94,579 | 80,045 | 71,883
Interest income | 895 | 85 | 538
Interest expense, net of capitalized interest | 46,394 | 36,405 | 30,975
Income tax provision (benefit) | 40,141 | 19,054 | 27,021
Net financial earnings (loss) | 140,124 | 107,375 | 126,902
Capital expenditures | 298,374 | 426,628 | 290,040
Operating Segments | Clean Energy Ventures |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 128,280 | 95,275 | 102,617
Depreciation and amortization | 21,396 | 20,567 | 25,329
Interest income | 0 | 241 | 240
Interest expense, net of capitalized interest | 21,968 | 22,548 | 20,253
Income tax provision (benefit) | 11,361 | 5,048 | 11,034
Net financial earnings (loss) | 39,403 | 16,789 | 22,111
Capital expenditures | 146,676 | 87,852 | 133,841
Intercompany |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 364 | 785 | 1,207
Intercompany | Natural Gas Distribution, External Customers |  |  |
Segment Reporting Information [Line Items] |  |  |
Utility | 1,350 | 0 | 0
Intercompany | Energy Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 94 | (426) | 1,116
Intercompany | Storage and Transportation |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 2,449 | 1,768 | 2,713
Home Services and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | 55,818 | 51,444 | 49,810
Operating revenues | 55,818 | 51,444 | 49,810
Depreciation and amortization | 824 | 980 | 1,032
Interest income | 944 | 522 | 8,633
Interest expense, net of capitalized interest | 646 | 4,054 | 10,327
Income tax provision (benefit) | 1,059 | (196) | (2,478)
Net financial earnings (loss) | (781) | (826) | 5,784
Capital expenditures | 1,390 | 2,630 | 3,230
Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | (4,257) | (2,127) | (5,036)
Depreciation and amortization | 0 | (276) | (292)
Interest income | (1,249) | (935) | (10,061)
Interest expense, net of capitalized interest | 0 | 0 | (10,358)
Income tax provision (benefit) | (21) | 1,052 | 285
Equity in earnings (loss) of affiliates | (1,688) | (2,140) | (1,592)
Net financial earnings (loss) | $ 0 | $ 211 | $ 98

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