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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 | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  | $ 787,987 |  | $ 627,713 |  | $ 971,724 |
Nonutility |  |  |  |  |  |  |  |  | 2,410,081 |  | 1,621,210 |  | 2,037,485 |
Total operating revenues | 733,695 | 767,469 | 960,885 | 736,019 | 568,470 | 425,121 | 612,921 | 642,411 | 3,198,068 |  | 2,248,923 |  | 3,009,209 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 47,310 |  | 41,643 |  | 34,370 |
Interest income |  |  |  |  |  |  |  |  | 837 | [1] | 1,026 | [1] | 1,216 | [1]
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 23,979 |  | 20,844 |  | 19,623 |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 35,575 |  | 7,729 |  | 37,665 |
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 10,349 |  | 10,634 |  | 11,839 |
Net financial earnings |  |  |  |  |  |  |  |  | 113,681 |  | 112,417 |  | 106,533 |
Capital expenditures |  |  |  |  |  |  |  |  | 197,250 |  | 207,515 |  | 177,531 |
Investments in equity investees |  |  |  |  |  |  |  |  | 0 |  | 8,800 |  | 0 |
Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | 3,156,553 |  | 2,210,581 |  | 3,024,889 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 46,526 |  | 40,992 |  | 33,628 |
Interest income |  |  |  |  |  |  |  |  | 1,719 | [1] | 2,024 | [1] | 2,043 | [1]
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 22,878 |  | 19,505 |  | 19,119 |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 33,197 |  | 5,656 |  | 36,701 |
Net financial earnings |  |  |  |  |  |  |  |  | 110,416 |  | 110,230 |  | 103,446 |
Capital expenditures |  |  |  |  |  |  |  |  | 196,208 |  | 206,181 |  | 173,982 |
Natural Gas Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 37,999 |  | 35,247 |  | 33,140 |
Interest income |  |  |  |  |  |  |  |  | 653 | [1] | 889 | [1] | 1,133 | [1]
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 14,995 |  | 14,890 |  | 14,875 |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 35,399 |  | 38,135 |  | 40,322 |
Net financial earnings |  |  |  |  |  |  |  |  | 73,846 |  | 73,238 |  | 71,322 |
Capital expenditures |  |  |  |  |  |  |  |  | 137,083 |  | 116,455 |  | 101,993 |
Natural Gas Distribution [Member] | External Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  | 787,987 |  | 627,713 |  | 971,724 |
Energy Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 44 |  | 59 |  | 61 |
Interest income |  |  |  |  |  |  |  |  | 1 | [1] | 37 | [1] | 9 | [1]
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 2,534 |  | 1,096 |  | 995 |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 10,516 |  | (4,950) |  | 3,281 |
Net financial earnings |  |  |  |  |  |  |  |  | 19,311 |  | 10,791 |  | 18,583 |
Energy Services [Member] | External Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 2,351,084 | [2] | 1,577,851 | [2] | 1,996,997 | [2]
Energy Services [Member] | Intercompany [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 5,494 |  | 2,760 |  | 55,306 |
Midstream [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 6 |  | 6 |  | 6 |
Interest income |  |  |  |  |  |  |  |  | 1,065 | [1] | 1,098 | [1] | 901 | [1]
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 1,962 |  | 2,665 |  | 3,165 |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 4,993 |  | 4,978 |  | 4,702 |
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | 13,868 |  | 14,308 |  | 14,904 |
Net financial earnings |  |  |  |  |  |  |  |  | 7,199 |  | 6,749 |  | 6,780 |
Clean Energy Ventures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,477 |  | 5,680 |  | 421 |
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 3,387 |  | 854 |  | 84 |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (17,711) |  | (32,507) |  | (11,604) |
Net financial earnings |  |  |  |  |  |  |  |  | 10,060 |  | 19,452 |  | 6,761 |
Capital expenditures |  |  |  |  |  |  |  |  | 59,125 |  | 89,726 |  | 71,989 |
Investments in equity investees |  |  |  |  |  |  |  |  | 0 |  | 8,800 |  | 0 |
Clean Energy Ventures [Member] | External Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 11,988 |  | 2,257 |  | 862 |
Retail and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 786 |  | 661 |  | 742 |
Interest income |  |  |  |  |  |  |  |  | 2 | [1] | 3 | [1] | 43 | [1]
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  | 1,101 |  | 1,339 |  | 504 |
Income tax provision (benefit) |  |  |  |  |  |  |  |  | 2,550 |  | 2,178 |  | 1,033 |
Net financial earnings |  |  |  |  |  |  |  |  | 3,292 |  | 2,366 |  | 3,087 |
Capital expenditures |  |  |  |  |  |  |  |  | 1,042 |  | 1,334 |  | 3,549 |
Retail and Other [Member] | External Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 47,009 |  | 41,102 |  | 39,626 |
Retail and Other [Member] | Intercompany [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | 945 |  | 1,093 |  | 334 |
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  | (6,439) |  | (3,853) |  | (55,640) |
Depreciation and amortization |  |  |  |  |  |  |  |  | (2) |  | (10) |  | 0 |
Interest income |  |  |  |  |  |  |  |  | (884) | [1] | (1,001) | [1] | (870) | [1]
Income tax provision (benefit) |  |  |  |  |  |  |  |  | (172) |  | (105) |  | (69) |
Equity in earnings of affiliates |  |  |  |  |  |  |  |  | (3,519) |  | (3,674) |  | (3,065) |
Net financial earnings |  |  |  |  |  |  |  |  | $ (27) |  | $ (179) |  | $ 0 |
Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage to total operating revenues |  |  |  |  |  |  |  |  | 5.90% |  | 6.60% |  | 6.10% |
[1] | Included in other income on the Consolidated Statement of Operations.
[2] | Includes sales to Canada, which accounted for 5.9 percent, 6.6 percent and 6.1 percent of total operating revenues during fiscal 2013, 2012 and 2011, respectively.

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