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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Utility $ 127,626 $ 128,532 $ 633,522 $ 645,375
Nonutility 239,967 170,442 990,563 908,249
Total operating revenues 367,593 298,974 1,624,085 1,553,624
Depreciation and amortization 27,767 27,872 81,977 80,025
Interest income 347 147 2,073 2,054
Interest expense, net of capitalized interest 18,744 15,144 58,683 50,417
Income tax provision (benefit) (18,785) (6,767) 37,713 25,988
Impairment of equity method investment (89,233) 3,213 (83,754) 10,191
Net financial earnings (loss) (14,148) 2,682 201,113 121,904
Capital expenditures 184,026 139,890 429,913 367,239
Investments in equity investees 208 225 690 1,491
Operating Segments        
Segment Reporting Information [Line Items]        
Total operating revenues 354,250 287,334 1,592,068 1,520,648
Depreciation and amortization 27,565 27,587 81,386 79,557
Interest income 451 608 2,394 3,722
Interest expense, net of capitalized interest 16,842 14,885 53,937 50,123
Income tax provision (benefit) (19,757) (6,708) 35,201 23,771
Net financial earnings (loss) (13,485) 3,278 203,624 121,089
Capital expenditures 183,782 137,928 428,858 365,262
Operating Segments | Natural Gas Distribution        
Segment Reporting Information [Line Items]        
Utility 127,626 128,532 633,522 645,375
Total operating revenues 127,626 128,532 633,522 645,375
Depreciation and amortization 19,894 18,269 58,538 53,186
Interest income 90 135 248 378
Interest expense, net of capitalized interest 8,667 7,455 26,647 22,760
Income tax provision (benefit) 889 939 24,878 29,276
Net financial earnings (loss) 1,581 11,968 131,589 142,160
Capital expenditures 150,642 88,171 327,127 238,010
Operating Segments | Clean Energy Ventures        
Segment Reporting Information [Line Items]        
Nonutility 13,381 13,396 26,227 25,603
Total operating revenues 13,381 13,396 26,227 25,603
Depreciation and amortization 5,200 6,777 15,318 19,696
Interest income 0 0 240 0
Interest expense, net of capitalized interest 4,998 5,070 15,298 14,397
Income tax provision (benefit) (1,448) (384) (7,248) (8,352)
Net financial earnings (loss) (4,926) (5,686) (24,072) (22,694)
Capital expenditures 10,661 41,182 51,545 110,968
Operating Segments | Energy Services        
Segment Reporting Information [Line Items]        
Nonutility 202,516 133,740 889,631 816,003
Total operating revenues 202,516 133,740 889,631 816,003
Depreciation and amortization 28 28 83 84
Interest income 11 10 11 99
Interest expense, net of capitalized interest 240 517 1,495 2,680
Income tax provision (benefit) (8,805) (8,909) 26,445 (606)
Net financial earnings (loss) (12,527) (6,619) 85,501 (9,254)
Operating Segments | Storage and Transportation        
Segment Reporting Information [Line Items]        
Nonutility 10,999 11,143 36,703 29,949
Total operating revenues 10,999 11,143 36,703 29,949
Depreciation and amortization 2,443 2,513 7,447 6,591
Interest income 350 463 1,895 3,245
Interest expense, net of capitalized interest 2,937 1,843 10,497 10,286
Income tax provision (benefit) (10,393) 1,646 (8,874) 3,453
Impairment of equity method investment (88,615) 3,615 (82,036) 11,200
Net financial earnings (loss) 2,387 3,615 10,606 10,877
Capital expenditures 22,479 8,575 50,186 16,284
Investments in equity investees 208 225 690 1,491
Intercompany        
Segment Reporting Information [Line Items]        
Nonutility 241 206 660 947
Intercompany | Energy Services        
Segment Reporting Information [Line Items]        
Nonutility (922) (197) 4,009 1,656
Intercompany | Storage and Transportation        
Segment Reporting Information [Line Items]        
Nonutility 650 720 1,976 2,062
Home Services and Other        
Segment Reporting Information [Line Items]        
Nonutility 13,071 12,163 38,002 36,694
Total operating revenues 13,071 12,163 38,002 36,694
Depreciation and amortization 260 265 747 761
Interest income 129 157 388 856
Interest expense, net of capitalized interest 1,902 427 4,746 1,264
Income tax provision (benefit) 415 (131) 474 2,044
Net financial earnings (loss) (384) (582) 301 675
Capital expenditures 244 1,962 1,055 1,977
Eliminations        
Segment Reporting Information [Line Items]        
Nonutility 31 (729) (6,645) (4,665)
Depreciation and amortization (58) 20 (156) (293)
Interest income (233) (618) (709) (2,524)
Interest expense, net of capitalized interest 0 (168) 0 (970)
Income tax provision (benefit) 557 72 2,038 173
Impairment of equity method investment (618) (402) (1,718) (1,009)
Net financial earnings (loss) $ (279) $ (14) $ (2,812) $ 140