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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, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Utility | $ 394,528 |  | $ 351,750 |  | $ 627,997 |  | $ 570,599 |
Nonutility | 1,185,041 |  | 609,135 |  | 1,829,977 |  | 1,126,305 |
Total operating revenues | 1,579,569 |  | 960,885 |  | 2,457,974 |  | 1,696,904 |
Depreciation and amortization | 12,828 |  | 11,721 |  | 25,394 |  | 23,024 |
Interest income | 216 | [1] | 192 | [1] | 512 | [1] | 399 | [1]
Interest expense, net of capitalized interest | 6,306 |  | 5,746 |  | 12,601 |  | 11,571 |
Income tax provision (benefit) | 71,680 |  | 12,065 |  | 73,185 |  | 36,045 |
Equity in earnings of affiliates | 3,233 |  | 3,530 |  | 5,375 |  | 6,085 |
Net financial earnings (loss) | 151,920 |  | 68,664 |  | 191,780 |  | 104,157 |
Capital expenditures | 56,242 |  | 41,243 |  | 116,765 |  | 90,862 |
Canada |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Percentage to total operating revenues |  |  |  |  | 4.00% |  | 6.90% |
Intercompany [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 297 |  | 186 |  | 499 |  | 449 |
Energy Services [Member] | Intercompany [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 67,749 |  | 4,444 |  | 71,767 |  | 4,551 |
Operating Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total operating revenues | 1,638,791 |  | 956,996 |  | 2,512,142 |  | 1,682,766 |
Depreciation and amortization | 12,622 |  | 11,515 |  | 24,981 |  | 22,636 |
Interest income | 451 | [1] | 409 | [1] | 980 | [1] | 847 | [1]
Interest expense, net of capitalized interest | 6,175 |  | 5,487 |  | 12,359 |  | 11,013 |
Income tax provision (benefit) | 72,255 |  | 12,753 |  | 74,117 |  | 36,898 |
Equity in earnings of affiliates | 3,233 |  | 3,530 |  | 5,375 |  | 6,085 |
Net financial earnings (loss) | 153,511 |  | 69,713 |  | 193,572 |  | 105,309 |
Capital expenditures | 55,970 |  | 41,099 |  | 116,288 |  | 90,564 |
Operating Segments [Member] | Natural Gas Distribution [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 9,972 |  | 9,399 |  | 19,807 |  | 18,676 |
Interest income | 181 | [1] | 146 | [1] | 442 | [1] | 313 | [1]
Interest expense, net of capitalized interest | 3,888 |  | 3,549 |  | 7,872 |  | 7,133 |
Income tax provision (benefit) | 23,725 |  | 22,794 |  | 37,908 |  | 37,301 |
Net financial earnings (loss) | 47,043 |  | 45,917 |  | 74,682 |  | 71,409 |
Capital expenditures | 35,484 |  | 31,554 |  | 70,885 |  | 65,699 |
Operating Segments [Member] | Natural Gas Distribution [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Utility | 394,528 |  | 351,750 |  | 627,997 |  | 570,599 |
Operating Segments [Member] | Energy Services [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 13 |  | 11 |  | 25 |  | 22 |
Interest expense, net of capitalized interest | 661 |  | 640 |  | 1,277 |  | 1,208 |
Income tax provision (benefit) | 64,345 |  | (5,203) |  | 53,072 |  | 10,961 |
Net financial earnings (loss) | 91,407 |  | 16,368 |  | 98,781 |  | 19,382 |
Operating Segments [Member] | Energy Services [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 1,173,835 | [2] | 599,362 | [2] | 1,807,526 | [2] | 1,102,997 | [2]
Operating Segments [Member] | Clean Energy Ventures [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 2,635 |  | 2,104 |  | 5,146 |  | 3,935 |
Interest expense, net of capitalized interest | 1,249 |  | 822 |  | 2,435 |  | 1,605 |
Income tax provision (benefit) | (17,388) |  | (6,457) |  | (19,432) |  | (14,226) |
Net financial earnings (loss) | 12,807 |  | 5,154 |  | 16,421 |  | 10,459 |
Capital expenditures | 20,486 |  | 9,545 |  | 45,403 |  | 24,865 |
Operating Segments [Member] | Clean Energy Ventures [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 2,679 |  | 1,440 |  | 4,852 |  | 4,619 |
Operating Segments [Member] | Midstream Investments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 2 |  | 1 |  | 3 |  | 3 |
Interest income | 270 | [1] | 263 | [1] | 538 | [1] | 534 | [1]
Interest expense, net of capitalized interest | 377 |  | 476 |  | 775 |  | 1,067 |
Income tax provision (benefit) | 1,573 |  | 1,619 |  | 2,569 |  | 2,862 |
Equity in earnings of affiliates | 4,141 |  | 4,469 |  | 7,083 |  | 7,960 |
Net financial earnings (loss) | 2,254 |  | 2,274 |  | 3,688 |  | 4,059 |
Corporate, Non-Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 208 |  | 199 |  | 415 |  | 390 |
Interest income | 0 | [1] | 1 | [1] | 0 | [1] | 2 | [1]
Interest expense, net of capitalized interest | 131 |  | 259 |  | 242 |  | 558 |
Income tax provision (benefit) | (1,129) |  | (906) |  | (1,320) |  | (1,029) |
Net financial earnings (loss) | (1,576) |  | (1,037) |  | (1,777) |  | (1,131) |
Capital expenditures | 272 |  | 144 |  | 477 |  | 298 |
Corporate, Non-Segment [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 8,527 |  | 8,334 |  | 17,599 |  | 18,689 |
Consolidation, Eliminations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | (68,046) |  | (4,631) |  | (72,266) |  | (5,000) |
Depreciation and amortization | (2) |  | 7 |  | (2) |  | (2) |
Interest income | (235) | [1] | (218) | [1] | (468) | [1] | (450) | [1]
Income tax provision (benefit) | 554 |  | 218 |  | 388 |  | 176 |
Equity in earnings of affiliates | (908) |  | (939) |  | (1,708) |  | (1,875) |
Net financial earnings (loss) | $ (15) |  | $ (12) |  | $ (15) |  | $ (21) |
[1] | Included in other income on the Unaudited Condensed Consolidated Statements of Operations.
[2] | Includes sales to Canada, which accounted for 4 percent and 6.9 percent of total operating revenues during the six months ended March 31, 2014 and 2013, respectively.

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