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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 | 9 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Utility | $ 119,022 |  | $ 106,764 |  | $ 689,621 |  | $ 524,161 |
Nonutility | 648,447 |  | 318,357 |  | 1,774,752 |  | 1,156,292 |
Total operating revenues | 767,469 |  | 425,121 |  | 2,464,373 |  | 1,680,453 |
Depreciation and amortization | 11,942 |  | 10,687 |  | 34,966 |  | 30,726 |
Interest income | 193 | [1] | 253 | [1] | 592 | [1] | 770 | [1]
Interest expense, net of capitalized interest | 6,008 |  | 4,834 |  | 17,579 |  | 15,266 |
Income tax provision (benefit) | 15,297 |  | (11,230) |  | 51,342 |  | 15,901 |
Equity in earnings of affiliates | 2,222 |  | 2,644 |  | 8,307 |  | 8,316 |
Net financial earnings (loss) | 9,738 |  | 4,130 |  | 113,895 |  | 123,564 |
Capital expenditures | 44,266 |  | 46,971 |  | 135,128 |  | 158,361 |
Natural Gas Distribution [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 9,537 |  | 8,860 |  | 28,213 |  | 26,241 |
Interest income | 146 | [1] | 223 | [1] | 459 | [1] | 683 | [1]
Interest expense, net of capitalized interest | 3,796 |  | 3,717 |  | 10,929 |  | 11,167 |
Income tax provision (benefit) | 1,788 |  | 1,114 |  | 39,089 |  | 43,726 |
Net financial earnings (loss) | 5,528 |  | 7,545 |  | 76,937 |  | 78,455 |
Capital expenditures | 29,141 |  | 33,405 |  | 94,840 |  | 82,550 |
Natural Gas Distribution [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Utility | 119,022 |  | 106,764 |  | 689,621 |  | 524,161 |
Clean Energy Ventures [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 2,196 |  | 1,632 |  | 6,131 |  | 3,953 |
Interest expense, net of capitalized interest | 870 |  | 190 |  | 2,475 |  | 530 |
Income tax provision (benefit) | (1,477) |  | (3,013) |  | (15,703) |  | (30,010) |
Net financial earnings (loss) | (1,381) |  | (1,157) |  | 9,078 |  | 20,802 |
Capital expenditures | 14,891 |  | 13,457 |  | 39,756 |  | 75,243 |
Clean Energy Ventures [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 2,563 |  | 370 |  | 7,182 |  | 1,277 |
Energy Services [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 10 |  | 16 |  | 32 |  | 48 |
Interest income | 0 | [1] | 10 | [1] | 0 | [1] | 36 | [1]
Interest expense, net of capitalized interest | 615 |  | 214 |  | 1,823 |  | 729 |
Income tax provision (benefit) | 12,945 |  | (11,511) |  | 23,906 |  | (2,108) |
Net financial earnings (loss) | 2,097 |  | (5,425) |  | 21,479 |  | 18,061 |
Energy Services [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 632,414 |  | 306,273 |  | 1,735,411 |  | 1,126,435 |
Energy Services [Member] | Intercompany/Eliminations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 1,119 |  | (32) |  | 5,670 |  | 2,816 |
Midstream Investments [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 2 |  | 1 |  | 5 |  | 4 |
Interest income | 265 | [1] | 267 | [1] | 799 | [1] | 800 | [1]
Interest expense, net of capitalized interest | 466 |  | 653 |  | 1,533 |  | 2,050 |
Income tax provision (benefit) | 1,073 |  | 1,126 |  | 3,935 |  | 3,750 |
Equity in earnings of affiliates | 3,052 |  | 3,547 |  | 11,012 |  | 11,129 |
Net financial earnings (loss) | 1,541 |  | 1,634 |  | 5,600 |  | 5,438 |
Reportable Segment [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Total operating revenues | 755,118 |  | 413,375 |  | 2,437,884 |  | 1,654,689 |
Depreciation and amortization | 11,745 |  | 10,509 |  | 34,381 |  | 30,246 |
Interest income | 411 | [1] | 500 | [1] | 1,258 | [1] | 1,519 | [1]
Interest expense, net of capitalized interest | 5,747 |  | 4,774 |  | 16,760 |  | 14,476 |
Income tax provision (benefit) | 14,329 |  | (12,284) |  | 51,227 |  | 15,358 |
Net financial earnings (loss) | 7,785 |  | 2,597 |  | 113,094 |  | 122,756 |
Capital expenditures | 44,032 |  | 46,862 |  | 134,596 |  | 157,793 |
Retail and Other [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 196 |  | 178 |  | 586 |  | 480 |
Interest income | (1) | [1] | 1 | [1] | 1 | [1] | 2 | [1]
Interest expense, net of capitalized interest | 261 |  | 60 |  | 819 |  | 790 |
Income tax provision (benefit) | 1,378 |  | 1,056 |  | 349 |  | 685 |
Net financial earnings (loss) | 1,944 |  | 1,549 |  | 813 |  | 860 |
Capital expenditures | 234 |  | 109 |  | 532 |  | 568 |
Retail and Other [Member] | External Customers [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 13,470 |  | 11,714 |  | 32,159 |  | 28,580 |
Retail and Other [Member] | Intercompany/Eliminations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | 234 |  | 278 |  | 683 |  | 720 |
Intercompany/Eliminations [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Nonutility | (1,353) |  | (246) |  | (6,353) |  | (3,536) |
Depreciation and amortization | 1 |  | 0 |  | (1) |  | 0 |
Interest income | (217) | [1] | (248) | [1] | (667) | [1] | (751) | [1]
Income tax provision (benefit) | (410) |  | (2) |  | (234) |  | (142) |
Equity in earnings of affiliates | (830) |  | (903) |  | (2,705) |  | (2,813) |
Net financial earnings (loss) | $ 9 |  | $ (16) |  | $ (12) |  | $ (52) |
[1] | Included in other income on the Unaudited Condensed Consolidated Statements of Operations.

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