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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |
Utility | $ 185,556 | $ 151,606
Nonutility | 355,472 | 292,652
Total operating revenues | 541,028 | 444,258
Depreciation and amortization | 19,260 | 16,482
Interest income | 75 | 70
Interest expense, net of capitalized interest | 10,615 | 6,777
Income tax provision (benefit) | 2,018 | 6,722
Equity in earnings of affiliates | 2,311 | 2,406
Net financial earnings | 40,383 | 51,267
Capital expenditures | 85,811 | 94,843
Investments in equity investees | $ 4,636 | $ 2,846
Canada |  |
Segment Reporting Information [Line Items] |  |
Percentage to total operating revenues | 1.90% | 3.50%
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total operating revenues | $ 530,304 | $ 438,093
Depreciation and amortization | 19,088 | 16,372
Interest income | 537 | 404
Interest expense, net of capitalized interest | 10,775 | 6,891
Income tax provision (benefit) | 1,473 | 8,318
Net financial earnings | 39,064 | 51,226
Capital expenditures | 85,640 | 94,046
Operating Segments | Natural Gas Distribution |  |
Segment Reporting Information [Line Items] |  |
Utility | 185,556 | 151,606
Depreciation and amortization | 12,030 | 11,238
Interest income | 75 | 68
Interest expense, net of capitalized interest | 6,824 | 4,588
Income tax provision (benefit) | 14,887 | 13,507
Net financial earnings | 30,348 | 30,926
Capital expenditures | 38,855 | 49,040
Operating Segments | Clean Energy Ventures |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 7,567 | 7,794
Depreciation and amortization | 7,041 | 5,110
Interest expense, net of capitalized interest | 3,324 | 2,053
Income tax provision (benefit) | (11,887) | (11,734)
Net financial earnings | 2,842 | 7,652
Capital expenditures | 46,785 | 45,006
Operating Segments | Energy Services |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 338,930 | 276,182
Depreciation and amortization | 16 | 23
Interest income | 0 | 72
Interest expense, net of capitalized interest | 571 | 208
Income tax provision (benefit) | (3,176) | 4,905
Net financial earnings | 3,487 | 10,304
Operating Segments | Midstream |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 1 | 1
Interest income | 462 | 264
Interest expense, net of capitalized interest | 56 | 42
Income tax provision (benefit) | 1,649 | 1,640
Equity in earnings of affiliates | 3,331 | 3,545
Net financial earnings | 2,387 | 2,344
Investments in equity investees | 4,636 | 2,846
Intercompany |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 1,031 | 897
Intercompany | Energy Services |  |
Segment Reporting Information [Line Items] |  |
Nonutility | (1,749) | 2,511
Home Services and Other |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 8,975 | 8,676
Depreciation and amortization | 221 | 227
Interest income | 121 | 37
Interest expense, net of capitalized interest | 74 | 0
Income tax provision (benefit) | (245) | (1,130)
Net financial earnings | 1,542 | 259
Capital expenditures | 171 | 797
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 718 | (3,408)
Depreciation and amortization | (49) | (117)
Interest income | (583) | (371)
Interest expense, net of capitalized interest | (234) | (114)
Income tax provision (benefit) | 790 | (466)
Equity in earnings of affiliates | (1,020) | (1,139)
Net financial earnings | $ (223) | $ (218)

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