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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Utility | $ 317,064 | $ 295,546 | $ 526,851 | $ 481,102
Nonutility | 701,979 | 438,000 | 1,197,497 | 793,472
Total operating revenues | 1,019,043 | 733,546 | 1,724,348 | 1,274,574
Depreciation and amortization | 22,460 | 20,328 | 44,314 | 39,588
Interest income | 194 | 108 | 250 | 183
Interest expense, net of capitalized interest | 11,798 | 11,436 | 23,703 | 22,051
Income tax (benefit) provision | 30,901 | 23,932 | (19,267) | 25,950
Equity in earnings of affiliates | 3,193 | 5,079 | 6,457 | 7,390
Net financial earnings | 142,062 | 104,106 | 277,395 | 144,489
Capital expenditures | 97,848 | 78,209 | 164,938 | 164,020
Investments in equity investees | 3,975 | 5,902 | $ 11,177 | $ 10,538
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage to total operating revenues |  |  | 0.01% | 1.50%
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 1,055,243 | 728,776 | $ 1,757,007 | $ 1,259,080
Depreciation and amortization | 22,298 | 20,205 | 44,031 | 39,293
Interest income | 1,008 | 609 | 1,791 | 1,146
Interest expense, net of capitalized interest | 12,455 | 11,577 | 24,765 | 22,352
Income tax (benefit) provision | 32,365 | 23,522 | (29,019) | 24,995
Net financial earnings | 144,640 | 103,670 | 287,784 | 142,734
Capital expenditures | 96,002 | 77,864 | 161,779 | 163,504
Operating Segments | Natural Gas Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Utility | 317,064 | 295,546 | 526,851 | 481,102
Depreciation and amortization | 13,353 | 12,263 | 26,136 | 24,293
Interest income | 131 | 97 | 250 | 172
Interest expense, net of capitalized interest | 6,523 | 6,392 | 13,059 | 13,216
Income tax (benefit) provision | 17,991 | 30,499 | 29,695 | 45,386
Net financial earnings | 60,442 | 60,233 | 94,551 | 90,581
Capital expenditures | 55,397 | 34,744 | 102,787 | 73,599
Operating Segments | Clean Energy Ventures |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 12,866 | 12,943 | 26,862 | 20,510
Depreciation and amortization | 8,928 | 7,923 | 17,863 | 14,964
Interest expense, net of capitalized interest | 4,344 | 4,055 | 8,552 | 7,379
Income tax (benefit) provision | (12,722) | (24,756) | (86,710) | (36,643)
Net financial earnings | 10,051 | 22,743 | 81,301 | 25,585
Capital expenditures | 40,605 | 43,120 | 58,992 | 89,905
Operating Segments | Energy Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 681,475 | 417,608 | 1,153,646 | 756,538
Depreciation and amortization | 15 | 17 | 29 | 33
Interest income | 106 | 0 | 106 | 0
Interest expense, net of capitalized interest | 1,203 | 716 | 2,460 | 1,287
Income tax (benefit) provision | 23,965 | 16,277 | 37,708 | 13,101
Net financial earnings | 72,832 | 15,746 | 93,106 | 19,233
Operating Segments | Midstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 2 | 2 | 3 | 3
Interest income | 771 | 512 | 1,435 | 974
Interest expense, net of capitalized interest | 385 | 414 | 694 | 470
Income tax (benefit) provision | 3,131 | 1,502 | (9,712) | 3,151
Equity in earnings of affiliates | 4,068 | 6,119 | 8,197 | 9,450
Net financial earnings | 1,315 | 4,948 | 18,826 | 7,335
Investments in equity investees | 3,975 | 5,902 | 11,177 | 10,538
Intercompany |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 623 | 1,055 | 1,229 | 2,086
Intercompany | Energy Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 43,838 | 2,679 | 49,648 | 930
Home Services and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 7,638 | 7,449 | 16,989 | 16,424
Depreciation and amortization | 189 | 199 | 377 | 420
Interest income | 354 | 132 | 558 | 253
Interest expense, net of capitalized interest | 21 | 123 | 111 | 197
Income tax (benefit) provision | (1,281) | 1,066 | 10,417 | 821
Net financial earnings | (2,488) | 708 | (10,204) | 2,250
Capital expenditures | 1,846 | 345 | 3,159 | 516
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | (44,461) | (3,734) | (50,877) | (3,016)
Depreciation and amortization | (27) | (76) | (94) | (125)
Interest income | (1,168) | (633) | (2,099) | (1,216)
Interest expense, net of capitalized interest | (678) | (264) | (1,173) | (498)
Income tax (benefit) provision | (183) | (656) | (665) | 134
Equity in earnings of affiliates | (875) | (1,040) | (1,740) | (2,060)
Net financial earnings | $ (90) | $ (272) | $ (185) | $ (495)

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