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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Utility $ 104,538 $ 121,362 $ 631,389 $ 602,464
Nonutility 438,897 336,161 1,636,394 1,129,633
Total operating revenues 543,435 457,523 2,267,783 1,732,097
Depreciation and amortization 20,320 20,760 64,634 60,348
Interest income 202 159 452 342
Interest expense, net of capitalized interest 11,037 11,164 34,740 33,215
Income tax (benefit) provision (28,534) (5,816) (47,801) 20,134
Equity in earnings of affiliates 3,213 3,065 9,670 10,455
Net financial earnings (8,003) 17,395 269,392 161,884
Capital expenditures 101,767 74,705 266,705 238,725
Investments in equity investees 3,319 13,559 14,496 24,097
Operating Segments        
Segment Reporting Information [Line Items]        
Total operating revenues 529,291 443,416 2,286,298 1,702,496
Depreciation and amortization 20,197 20,596 64,228 59,889
Interest income 1,281 789 3,072 1,935
Interest expense, net of capitalized interest 11,986 11,436 36,751 33,788
Income tax (benefit) provision (29,676) (6,784) (58,695) 18,211
Net financial earnings (9,979) 16,119 277,805 158,853
Capital expenditures 101,022 74,288 265,405 237,792
Operating Segments | Natural Gas Distribution        
Segment Reporting Information [Line Items]        
Utility 104,538 121,362 631,389 602,464
Depreciation and amortization 13,473 12,425 39,609 36,718
Interest income 202 202 452 374
Interest expense, net of capitalized interest 6,226 6,294 19,285 19,510
Income tax (benefit) provision (25,314) 1,496 4,381 46,882
Net financial earnings 2,440 5,951 96,991 96,532
Capital expenditures 70,623 42,235 173,410 115,834
Operating Segments | Clean Energy Ventures        
Segment Reporting Information [Line Items]        
Nonutility 15,348 14,915 42,210 35,425
Depreciation and amortization 6,702 8,154 24,565 23,118
Interest expense, net of capitalized interest 4,708 4,345 13,260 11,724
Income tax (benefit) provision (565) (8,122) (87,275) (44,765)
Net financial earnings (829) 6,276 80,472 31,861
Capital expenditures 29,424 32,053 88,416 121,958
Operating Segments | Energy Services        
Segment Reporting Information [Line Items]        
Nonutility 409,417 307,448 1,563,063 1,063,986
Depreciation and amortization 21 16 50 49
Interest income 134 6 240 6
Interest expense, net of capitalized interest 581 586 3,041 1,873
Income tax (benefit) provision (4,786) (1,767) 32,922 11,334
Net financial earnings (15,079) 933 78,027 20,166
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Depreciation and amortization 1 1 4 4
Interest income 945 581 2,380 1,555
Interest expense, net of capitalized interest 471 211 1,165 681
Income tax (benefit) provision 989 1,609 (8,723) 4,760
Equity in earnings of affiliates 3,907 4,049 12,104 13,499
Net financial earnings 3,489 2,959 22,315 10,294
Capital expenditures 975 0 3,579 0
Investments in equity investees 3,319 13,559 14,496 24,097
Intercompany        
Segment Reporting Information [Line Items]        
Nonutility 627 610 1,856 2,696
Intercompany | Energy Services        
Segment Reporting Information [Line Items]        
Nonutility (12) (309) 49,636 621
Home Services and Other        
Segment Reporting Information [Line Items]        
Nonutility 14,132 13,798 31,121 30,222
Depreciation and amortization 193 186 570 606
Interest income 340 155 898 408
Interest expense, net of capitalized interest (129) 116 (18) 313
Income tax (benefit) provision 1,122 853 11,539 1,674
Net financial earnings 1,993 1,295 (8,211) 3,545
Capital expenditures 745 417 1,300 933
Eliminations        
Segment Reporting Information [Line Items]        
Nonutility (615) (301) (51,492) (3,317)
Depreciation and amortization (70) (22) (164) (147)
Interest income (1,419) (785) (3,518) (2,001)
Interest expense, net of capitalized interest (820) (388) (1,993) (886)
Income tax (benefit) provision 20 115 (645) 249
Equity in earnings of affiliates (694) (984) (2,434) (3,044)
Net financial earnings $ (17) $ (19) $ (202) $ (514)