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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, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Utility |  | $ 151,606 | $ 208,727
Nonutility |  | 292,652 | 615,397
Total operating revenues |  | 444,258 | 824,124
Depreciation and amortization |  | 16,482 | 14,386
Interest income | [1] | 70 | 90
Interest expense, net of capitalized interest |  | 6,777 | 7,195
Income tax provision (benefit) |  | 8,357 | 40,867
Equity in earnings of affiliates |  | 2,406 | 2,795
Net financial earnings |  | 49,632 | 55,109
Capital expenditures |  | 94,843 | 92,104
Investments in equity investees |  | $ 2,846 | $ 547
Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage to total operating revenues |  | 3.50% | 4.70%
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating revenues |  | $ 438,093 | $ 818,650
Depreciation and amortization |  | 16,372 | 14,160
Interest income | [1] | 404 | 329
Interest expense, net of capitalized interest |  | 6,891 | 7,189
Income tax provision (benefit) |  | 9,111 | 41,814
Net financial earnings |  | 50,433 | 55,750
Capital expenditures |  | 94,046 | 92,093
Operating Segments [Member] | Natural Gas Distribution [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization |  | 11,238 | 10,545
Interest income | [1] | 68 | 90
Interest expense, net of capitalized interest |  | 4,588 | 4,609
Income tax provision (benefit) |  | 13,863 | 14,166
Net financial earnings |  | 30,570 | 28,186
Capital expenditures |  | 49,040 | 36,748
Operating Segments [Member] | Natural Gas Distribution [Member] | External Customers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Utility |  | 151,606 | 208,727
Operating Segments [Member] | Energy Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization |  | 23 | 22
Interest income | [1] | 72 | 0
Interest expense, net of capitalized interest |  | 208 | 513
Income tax provision (benefit) |  | 5,195 | 45,877
Net financial earnings |  | 10,014 | 16,436
Operating Segments [Member] | Energy Services [Member] | External Customers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility | [2] | 276,182 | 600,562
Operating Segments [Member] | Energy Services [Member] | Intercompany [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility |  | 2,511 | 3,126
Operating Segments [Member] | Clean Energy Ventures [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization |  | 5,110 | 3,591
Interest expense, net of capitalized interest |  | 2,053 | 1,817
Income tax provision (benefit) |  | (11,587) | (19,721)
Net financial earnings |  | 7,505 | 9,008
Capital expenditures |  | 45,006 | 55,345
Operating Segments [Member] | Clean Energy Ventures [Member] | External Customers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility |  | 7,794 | 6,235
Operating Segments [Member] | Home Services and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization |  | 227 | 238
Interest income | [1] | 37 | 0
Interest expense, net of capitalized interest |  | 0 | 6
Income tax provision (benefit) |  | (288) | (452)
Net financial earnings |  | (583) | (592)
Capital expenditures |  | 797 | 11
Operating Segments [Member] | Home Services and Other [Member] | External Customers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility |  | 8,676 | 8,600
Operating Segments [Member] | Home Services and Other [Member] | Intercompany [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility |  | 897 | 411
Operating Segments [Member] | Midstream [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization |  | 1 | 2
Interest income | [1] | 264 | 239
Interest expense, net of capitalized interest |  | 42 | 250
Income tax provision (benefit) |  | 1,640 | 1,492
Equity in earnings of affiliates |  | 3,545 | 3,775
Net financial earnings |  | 2,344 | 2,120
Investments in equity investees |  | 2,846 | 547
Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Nonutility |  | (3,408) | (3,537)
Depreciation and amortization |  | (117) | (12)
Interest income | [1] | (371) | (239)
Interest expense, net of capitalized interest |  | (114) | 0
Income tax provision (benefit) |  | (466) | (495)
Equity in earnings of affiliates |  | (1,139) | (980)
Net financial earnings |  | $ (218) | $ (49)
[1] | Included in other income, net on the Unaudited Condensed Consolidated Statements of Operations.
[2] | Includes sales to Canada, which accounted for 3.5 and 4.7 percent of total operating revenues during the three months ended December 31, 2015 and 2014.

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