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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Utility | $ 351,750 |  | $ 226,023 |  | $ 570,599 |  | $ 417,397 |
Nonutility | 609,135 |  | 386,898 |  | 1,126,305 |  | 837,935 |
Total operating revenues | 960,885 |  | 612,921 |  | 1,696,904 |  | 1,255,332 |
Depreciation and amortization | 11,721 |  | 10,439 |  | 23,024 |  | 20,039 |
Investment income, interest | 192 |  | 227 |  | 399 |  | 517 |
Interest expense, net of capitalized interest | 5,746 |  | 5,427 |  | 11,571 |  | 10,432 |
Income tax provision (benefit) | 12,065 |  | 11,094 |  | 36,045 |  | 27,131 |
Equity in earnings of affiliates | 3,530 |  | 3,018 |  | 6,085 |  | 5,672 |
Net financial earnings (loss) | 68,664 |  | 74,126 |  | 104,157 |  | 119,434 |
Capital expenditures | 41,243 |  | 41,972 |  | 90,862 |  | 111,390 |
Natural Gas Distribution [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 9,399 |  | 8,749 |  | 18,676 |  | 17,381 |
Investment income, interest | 146 | [1] | 214 | [1] | 313 | [1] | 460 | [1]
Interest expense, net of capitalized interest | 3,549 |  | 3,713 |  | 7,133 |  | 7,450 |
Income tax provision (benefit) | 22,794 |  | 27,016 |  | 37,301 |  | 42,612 |
Net financial earnings (loss) | 45,917 |  | 44,936 |  | 71,409 |  | 70,910 |
Capital expenditures | 31,554 |  | 27,427 |  | 65,699 |  | 49,145 |
Natural Gas Distribution [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Utility | 351,750 |  | 226,023 |  | 570,599 |  | 417,397 |
Clean Energy Ventures [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 2,104 |  | 1,511 |  | 3,935 |  | 2,321 |
Interest expense, net of capitalized interest | 822 |  | 198 |  | 1,605 |  | 340 |
Income tax provision (benefit) | (6,457) |  | (14,826) |  | (14,226) |  | (26,997) |
Net financial earnings (loss) | 5,154 |  | 11,862 |  | 10,459 |  | 21,959 |
Capital expenditures | 9,545 |  | 14,175 |  | 24,865 |  | 61,786 |
Clean Energy Ventures [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 1,440 |  | 527 |  | 4,619 |  | 907 |
Energy Services [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 11 |  | 16 |  | 22 |  | 32 |
Investment income, interest | 0 | [1] | (5) | [1] | 0 | [1] | 26 | [1]
Interest expense, net of capitalized interest | 640 |  | 245 |  | 1,208 |  | 515 |
Income tax provision (benefit) | (5,203) |  | (2,105) |  | 10,961 |  | 9,403 |
Net financial earnings (loss) | 16,368 |  | 15,871 |  | 19,382 |  | 23,486 |
Energy Services [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 599,362 |  | 378,356 |  | 1,102,997 |  | 820,162 |
Energy Services [Member] | Business Intersegment, Eliminations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 4,444 |  | 2,654 |  | 4,551 |  | 2,848 |
Energy Holdings [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 1 |  | 2 |  | 3 |  | 3 |
Investment income, interest | 263 | [1] | 285 | [1] | 534 | [1] | 533 | [1]
Interest expense, net of capitalized interest | 476 |  | 683 |  | 1,067 |  | 1,397 |
Income tax provision (benefit) | 1,619 |  | 1,393 |  | 2,862 |  | 2,624 |
Equity in earnings of affiliates | 4,469 |  | 3,967 |  | 7,960 |  | 7,582 |
Net financial earnings (loss) | 2,274 |  | 2,021 |  | 4,059 |  | 3,804 |
Reportable Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total operating revenues | 956,996 |  | 607,560 |  | 1,682,766 |  | 1,241,314 |
Depreciation and amortization | 11,515 |  | 10,278 |  | 22,636 |  | 19,737 |
Investment income, interest | 409 |  | 494 |  | 847 |  | 1,019 |
Interest expense, net of capitalized interest | 5,487 |  | 4,839 |  | 11,013 |  | 9,702 |
Income tax provision (benefit) | 12,753 |  | 11,478 |  | 36,898 |  | 27,642 |
Net financial earnings (loss) | 69,713 |  | 74,690 |  | 105,309 |  | 120,159 |
Capital expenditures | 41,099 |  | 41,602 |  | 90,564 |  | 110,931 |
Retail and Other [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 199 |  | 161 |  | 390 |  | 302 |
Investment income, interest | 1 |  | 1 |  | 2 |  | 1 |
Interest expense, net of capitalized interest | 259 |  | 588 |  | 558 |  | 730 |
Income tax provision (benefit) | (906) |  | (312) |  | (1,029) |  | (371) |
Net financial earnings (loss) | (1,037) |  | (543) |  | (1,131) |  | (689) |
Capital expenditures | 144 |  | 370 |  | 298 |  | 459 |
Retail and Other [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 8,334 |  | 8,014 |  | 18,689 |  | 16,866 |
Retail and Other [Member] | Business Intersegment, Eliminations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 186 |  | 263 |  | 449 |  | 442 |
Business Intersegment, Eliminations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | (4,631) |  | (2,916) |  | (5,000) |  | (3,290) |
Depreciation and amortization | 7 |  | 0 |  | (2) |  | 0 |
Investment income, interest | (218) |  | (268) |  | (450) |  | (503) |
Income tax provision (benefit) | 218 |  | (72) |  | 176 |  | (140) |
Equity in earnings of affiliates | (939) |  | (949) |  | (1,875) |  | (1,910) |
Net financial earnings (loss) | $ (12) |  | $ (21) |  | $ (21) |  | $ (36) |
[1] | Included in other income on the Unaudited Condensed Consolidated Statements of Operations.

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