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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, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  |  | $ 731,865 | $ 695,637 | $ 594,346
Nonutility |  |  |  |  |  |  |  |  |  | 2,183,244 | 1,572,980 | 1,286,559
Total operating revenues |  | $ 647,326 | $ 543,435 | $ 1,019,043 | $ 705,305 | $ 536,520 | $ 457,523 | $ 733,546 | $ 541,028 | 2,915,109 | 2,268,617 | 1,880,905
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 85,701 | 81,841 | 72,748
Interest income |  |  |  |  |  |  |  |  |  | 614 | 2,034 | 128
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 46,286 | 44,886 | 31,044
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (53,785) | 18,343 | 23,530
Equity in earnings of affiliates |  |  |  |  |  |  |  |  |  | 13,008 | 13,813 | 9,515
Net financial earnings (loss) |  |  |  |  |  |  |  |  |  | 240,486 | 149,392 | 138,085
Capital expenditures |  |  |  |  |  |  |  |  |  | 384,588 | 328,083 | 356,092
Investments in equity investees |  |  |  |  |  |  |  |  |  | 16,151 | 27,070 | 11,176
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | 2,916,044 | 2,222,712 | 1,845,139
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 85,167 | 81,250 | 71,893
Interest income | [1] |  |  |  |  |  |  |  |  | 4,228 | 2,756 | 1,737
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 49,231 | 45,788 | 31,616
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (65,394) | 14,129 | 21,519
Net financial earnings (loss) |  |  |  |  |  |  |  |  |  | 244,642 | 143,214 | 135,837
Capital expenditures |  |  |  |  |  |  |  |  |  | 383,375 | 325,649 | 354,196
Operating Segments | Natural Gas Distribution |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  |  | 731,865 | 695,637 | 594,346
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 53,208 | 49,347 | 47,828
Interest income | [1] |  |  |  |  |  |  |  |  | 614 | 555 | 115
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 25,299 | 25,818 | 19,930
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (1,910) | 43,485 | 34,951
Net financial earnings (loss) |  |  |  |  |  |  |  |  |  | 84,048 | 86,930 | 76,104
Capital expenditures |  |  |  |  |  |  |  |  |  | 254,523 | 176,249 | 205,133
Operating Segments | Clean Energy Ventures |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | 71,375 | 64,394 | 53,540
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 31,877 | 31,834 | 23,971
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 18,320 | 16,263 | 10,304
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (79,932) | (31,161) | (26,592)
Net financial earnings (loss) |  |  |  |  |  |  |  |  |  | 75,849 | 24,873 | 28,393
Capital expenditures |  |  |  |  |  |  |  |  |  | 123,421 | 149,400 | 149,063
Operating Segments | Energy Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility | [2] |  |  |  |  |  |  |  |  | 2,064,477 | 1,462,365 | 1,187,754
Depreciation and amortization | [3] |  |  |  |  |  |  |  |  | 76 | 63 | 88
Interest income | [1] |  |  |  |  |  |  |  |  | 240 | 6 | 98
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 3,945 | 2,747 | 1,095
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | 24,996 | (4,015) | 7,030
Net financial earnings (loss) |  |  |  |  |  |  |  |  |  | 60,378 | 18,554 | 21,934
Operating Segments | Midstream |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 6 | 6 | 6
Interest income | [1] |  |  |  |  |  |  |  |  | 3,374 | 2,195 | 1,524
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 1,667 | 960 | 287
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (8,548) | 5,820 | 6,130
Equity in earnings of affiliates |  |  |  |  |  |  |  |  |  | 16,165 | 17,797 | 13,936
Net financial earnings (loss) |  |  |  |  |  |  |  |  |  | 24,367 | 12,857 | 9,406
Capital expenditures |  |  |  |  |  |  |  |  |  | 5,431 | 0 | 0
Investments in equity investees |  |  |  |  |  |  |  |  |  | 16,151 | 27,070 | 11,176
Intercompany |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | 2,665 | 3,370 | 3,232
Intercompany | Energy Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | 48,327 | 316 | 9,499
Home Services and Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | 47,392 | 46,221 | 45,265
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 780 | 798 | 981
Interest income |  |  |  |  |  |  |  |  |  | 1,476 | 590 | 397
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 7 | 410 | 252
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | 11,944 | 3,857 | 1,387
Net financial earnings (loss) |  |  |  |  |  |  |  |  |  | (3,829) | 6,811 | 2,882
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,213 | 2,434 | 1,896
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | (50,992) | (3,686) | (12,731)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (246) | (207) | (126)
Interest income |  |  |  |  |  |  |  |  |  | (5,090) | (1,312) | (2,006)
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | (2,952) | (1,312) | (824)
Income tax (benefit) provision |  |  |  |  |  |  |  |  |  | (335) | 357 | 624
Equity in earnings of affiliates |  |  |  |  |  |  |  |  |  | (3,157) | (3,984) | (4,421)
Net financial earnings (loss) |  |  |  |  |  |  |  |  |  | $ (327) | $ (633) | $ (634)
[1] | Included in other income, net on the Consolidated Statements of Operations.
[2] | Includes sales to Canada, which are immaterial.
[3] | The amortization of acquired wholesale energy contracts is excluded above and is included in gas purchases - nonutility on the Unaudited Condensed Consolidated Statements of Operations.

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