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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |
Utility | $ 209,787 | $ 185,556
Nonutility | 495,518 | 355,472
Total operating revenues | 705,305 | 541,028
Depreciation and amortization | 21,854 | 19,260
Interest income | 56 | 75
Interest expense, net of capitalized interest | 11,905 | 10,615
Income tax (benefit) provision | (50,168) | 2,018
Equity in earnings of affiliates | 3,264 | 2,311
Net financial earnings | 135,333 | 40,383
Capital expenditures | 67,090 | 85,811
Investments in equity investees | $ 7,202 | $ 4,636
Canada |  |
Segment Reporting Information [Line Items] |  |
Percentage to total operating revenues | 0.02% | 1.90%
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total operating revenues | $ 701,764 | $ 530,304
Depreciation and amortization | 21,733 | 19,088
Interest income | 783 | 537
Interest expense, net of capitalized interest | 12,310 | 10,775
Income tax (benefit) provision | (61,384) | 1,473
Net financial earnings | 143,144 | 39,064
Capital expenditures | 65,777 | 85,640
Operating Segments | Natural Gas Distribution |  |
Segment Reporting Information [Line Items] |  |
Utility | 209,787 | 185,556
Depreciation and amortization | 12,783 | 12,030
Interest income | 119 | 75
Interest expense, net of capitalized interest | 6,536 | 6,824
Income tax (benefit) provision | 11,704 | 14,887
Net financial earnings | 34,109 | 30,348
Capital expenditures | 47,390 | 38,855
Operating Segments | Clean Energy Ventures |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 13,996 | 7,567
Depreciation and amortization | 8,935 | 7,041
Interest expense, net of capitalized interest | 4,208 | 3,324
Income tax (benefit) provision | (73,988) | (11,887)
Net financial earnings | 71,250 | 2,842
Capital expenditures | 18,387 | 46,785
Operating Segments | Energy Services |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 472,171 | 338,930
Depreciation and amortization | 14 | 16
Interest expense, net of capitalized interest | 1,257 | 571
Income tax (benefit) provision | 13,743 | (3,176)
Net financial earnings | 20,274 | 3,487
Operating Segments | Midstream |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 1 | 1
Interest income | 664 | 462
Interest expense, net of capitalized interest | 309 | 56
Income tax (benefit) provision | (12,843) | 1,649
Equity in earnings of affiliates | 4,129 | 3,331
Net financial earnings | 17,511 | 2,387
Investments in equity investees | 7,202 | 4,636
Intercompany |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 606 | 1,031
Intercompany | Energy Services |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 5,810 | (1,749)
Home Services and Other |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 9,351 | 8,975
Depreciation and amortization | 188 | 221
Interest income | 204 | 121
Interest expense, net of capitalized interest | 90 | 74
Income tax (benefit) provision | 11,698 | (245)
Net financial earnings | (7,716) | 1,542
Capital expenditures | 1,313 | 171
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Nonutility | (6,416) | 718
Depreciation and amortization | (67) | (49)
Interest income | (931) | (583)
Interest expense, net of capitalized interest | (495) | (234)
Income tax (benefit) provision | (482) | 790
Equity in earnings of affiliates | (865) | (1,020)
Net financial earnings | $ (95) | $ (223)

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