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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