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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |
Utility | $ 233,469 |  | $ 218,849 |
Nonutility | 644,936 |  | 517,170 |
Total operating revenues | 878,405 |  | 736,019 |
Depreciation and amortization | 12,566 |  | 11,303 |
Interest income | 296 | [1] | 207 | [1]
Interest expense, net of capitalized interest | 6,295 |  | 5,825 |
Income tax provision (benefit) | 1,505 |  | 23,980 |
Equity in earnings of affiliates | 2,142 |  | 2,555 |
Net financial earnings (loss) | 39,860 |  | 35,493 |
Capital expenditures | 60,523 |  | 49,619 |
Intercompany/Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | (4,220) |  | (369) |
Depreciation and amortization | 0 |  | (9) |
Interest income | (233) | [1] | (232) | [1]
Income tax provision (benefit) | (166) |  | (42) |
Equity in earnings of affiliates | (800) |  | (936) |
Net financial earnings (loss) | 0 |  | (9) |
Natural Gas Distribution [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 9,835 |  | 9,277 |
Interest income | 261 | [1] | 167 | [1]
Interest expense, net of capitalized interest | 3,984 |  | 3,584 |
Income tax provision (benefit) | 14,183 |  | 14,507 |
Net financial earnings (loss) | 27,639 |  | 25,492 |
Capital expenditures | 35,401 |  | 34,145 |
Natural Gas Distribution [Member] | External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Utility | 233,469 |  | 218,849 |
Energy Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 12 |  | 11 |
Interest income | 0 | [1] | 0 | [1]
Interest expense, net of capitalized interest | 616 |  | 568 |
Income tax provision (benefit) | (11,273) |  | 16,164 |
Net financial earnings (loss) | 7,374 |  | 3,014 |
Energy Services [Member] | External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 633,691 | [2] | 503,635 | [2]
Energy Services [Member] | Intercompany/Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 4,018 |  | 107 |
Clean Energy Ventures [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 2,511 |  | 1,831 |
Interest expense, net of capitalized interest | 1,186 |  | 783 |
Income tax provision (benefit) | (2,044) |  | (7,769) |
Net financial earnings (loss) | 3,614 |  | 5,305 |
Capital expenditures | 24,917 |  | 15,320 |
Clean Energy Ventures [Member] | External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 2,173 |  | 3,179 |
Midstream Investments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 1 |  | 2 |
Interest income | 268 | [1] | 271 | [1]
Interest expense, net of capitalized interest | 398 |  | 591 |
Income tax provision (benefit) | 996 |  | 1,243 |
Equity in earnings of affiliates | 2,942 |  | 3,491 |
Net financial earnings (loss) | 1,434 |  | 1,785 |
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 873,351 |  | 725,770 |
Depreciation and amortization | 12,359 |  | 11,121 |
Interest income | 529 | [1] | 438 | [1]
Interest expense, net of capitalized interest | 6,184 |  | 5,526 |
Income tax provision (benefit) | 1,862 |  | 24,145 |
Net financial earnings (loss) | 40,061 |  | 35,596 |
Capital expenditures | 60,318 |  | 49,465 |
Retail and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 207 |  | 191 |
Interest income | 0 | [1] | 1 | [1]
Interest expense, net of capitalized interest | 111 |  | 299 |
Income tax provision (benefit) | (191) |  | (123) |
Net financial earnings (loss) | (201) |  | (94) |
Capital expenditures | 205 |  | 154 |
Retail and Other [Member] | External Customers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 9,072 |  | 10,355 |
Retail and Other [Member] | Intercompany/Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | $ 202 |  | $ 263 |
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage to total operating revenues | 3.80% |  | 7.60% |
[1] | Included in other income on the Unaudited Condensed Consolidated Statements of Operations.
[2] | Includes sales to Canada, which accounted for 3.8 percent and 7.6 percent of total operating revenues during the three months ended December 31, 2013 and 2012, respectively.

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