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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  | $ 695,637 | $ 594,346 | $ 781,970
Nonutility |  |  |  |  |  |  |  |  | 1,572,980 | 1,286,559 | 1,952,017
Total operating revenues | $ 536,520 | $ 457,523 | $ 733,546 | $ 541,028 | $ 469,241 | $ 393,213 | $ 574,193 | $ 444,258 | 2,268,617 | 1,880,905 | 2,733,987
Depreciation and amortization |  |  |  |  |  |  |  |  | 81,841 | 72,748 | 61,399
Interest income |  |  |  |  |  |  |  |  | 2,034 | 128 | 580
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 44,886 | 31,044 | 27,721
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 18,343 | 23,530 | 59,724
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 13,813 | 9,515 | 13,409
Net financial earnings |  |  |  |  |  |  |  |  | 149,392 | 138,085 | 151,503
Capital expenditures |  |  |  |  |  |  |  |  | 328,083 | 356,092 | 320,086
Investments in equity investees |  |  |  |  |  |  |  |  | $ 27,070 | $ 11,176 | $ 5,780
CANADA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage to total operating revenues |  |  |  |  |  |  |  |  | 0.80% | 2.00% | 3.70%
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | $ 2,222,712 | $ 1,845,139 | $ 2,748,790
Depreciation and amortization |  |  |  |  |  |  |  |  | 81,250 | 71,893 | 60,478
Interest income |  |  |  |  |  |  |  |  | 2,756 | 1,737 | 1,777
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 45,788 | 31,616 | 28,095
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 14,129 | 21,519 | 58,468
Net financial earnings |  |  |  |  |  |  |  |  | 143,214 | 135,837 | 148,290
Capital expenditures |  |  |  |  |  |  |  |  | 325,649 | 354,196 | 319,877
Operating Segments | Natural Gas Distribution |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  | 695,637 | 594,346 | 781,970
Depreciation and amortization |  |  |  |  |  |  |  |  | 49,347 | 47,828 | 43,085
Interest income |  |  |  |  |  |  |  |  | 555 | 115 | 336
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 25,818 | 19,930 | 18,534
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 43,485 | 34,951 | 39,544
Net financial earnings |  |  |  |  |  |  |  |  | 86,930 | 76,104 | 76,287
Capital expenditures |  |  |  |  |  |  |  |  | 176,249 | 205,133 | 168,875
Operating Segments | Clean Energy Ventures |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 64,394 | 53,540 | 32,513
Depreciation and amortization |  |  |  |  |  |  |  |  | 31,834 | 23,971 | 17,297
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 26
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 16,263 | 10,304 | 7,635
Income tax (benefit) provision |  |  |  |  |  |  |  |  | (31,161) | (26,592) | (26,968)
Net financial earnings |  |  |  |  |  |  |  |  | 24,873 | 28,393 | 20,101
Capital expenditures |  |  |  |  |  |  |  |  | 149,400 | 149,063 | 151,002
Operating Segments | Energy Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 1,462,365 | 1,187,754 | 1,872,781
Depreciation and amortization |  |  |  |  |  |  |  |  | 63 | 88 | 90
Interest income |  |  |  |  |  |  |  |  | 6 | 98 | 438
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 2,747 | 1,095 | 1,209
Income tax (benefit) provision |  |  |  |  |  |  |  |  | (4,015) | 7,030 | 39,043
Net financial earnings |  |  |  |  |  |  |  |  | 18,554 | 21,934 | 42,122
Operating Segments | Midstream |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 6 | 6 | 6
Interest income |  |  |  |  |  |  |  |  | 2,195 | 1,524 | 977
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 960 | 287 | 717
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 5,820 | 6,130 | 6,849
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 17,797 | 13,936 | 17,487
Net financial earnings |  |  |  |  |  |  |  |  | 12,857 | 9,406 | 9,780
Investments in equity investees |  |  |  |  |  |  |  |  | 27,070 | 11,176 | 5,780
Intercompany |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 3,370 | 3,232 | 1,980
Intercompany | Energy Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 316 | 9,499 | 61,526
Home Services and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 46,221 | 45,265 | 46,723
Depreciation and amortization |  |  |  |  |  |  |  |  | 798 | 981 | 952
Interest income |  |  |  |  |  |  |  |  | 590 | 397 | 217
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 410 | 252 | 49
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 3,857 | 1,387 | 1,551
Net financial earnings |  |  |  |  |  |  |  |  | 6,811 | 2,882 | 3,420
Capital expenditures |  |  |  |  |  |  |  |  | 2,434 | 1,896 | 209
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | (3,686) | (12,731) | (63,506)
Depreciation and amortization |  |  |  |  |  |  |  |  | (207) | (126) | (31)
Interest income |  |  |  |  |  |  |  |  | (1,312) | (2,006) | (1,414)
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | (1,312) | (824) | (423)
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 357 | 624 | (295)
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | (3,984) | (4,421) | (4,078)
Net financial earnings |  |  |  |  |  |  |  |  | $ (633) | $ (634) | $ (207)

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