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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, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |
Utility | $ 218,849 | $ 191,374
Nonutility | 517,170 | 451,037
Total operating revenues | 736,019 | 642,411
Depreciation and amortization | 11,303 | 9,600
Investment income, interest | 207 | 290
Interest expense, net of capitalized interest | 5,825 | 5,005
Income tax provision (benefit) | 23,980 | 16,037
Equity in earnings of affiliates | 2,555 | 2,654
Net financial earnings (loss) | 35,493 | 45,308
Capital expenditures | 49,619 | 69,418
Natural Gas Distribution [Member] |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 9,277 | 8,632
Investment income, interest | 167 | 246
Interest expense, net of capitalized interest | 3,584 | 3,737
Income tax provision (benefit) | 14,507 | 15,596
Net financial earnings (loss) | 25,492 | 25,974
Capital expenditures | 34,145 | 21,718
Natural Gas Distribution [Member] | External Customers [Member] |  |
Segment Reporting Information [Line Items] |  |
Utility | 218,849 | 191,374
Clean Energy Ventures [Member] |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 1,831 | 810
Interest expense, net of capitalized interest | 783 | 142
Income tax provision (benefit) | (7,769) | (12,171)
Net financial earnings (loss) | 5,305 | 10,097
Capital expenditures | 15,320 | 47,611
Clean Energy Ventures [Member] | External Customers [Member] |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 3,179 | 380
Energy Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 11 | 16
Investment income, interest | 0 | 31
Interest expense, net of capitalized interest | 568 | 270
Income tax provision (benefit) | 16,164 | 11,508
Net financial earnings (loss) | 3,014 | 7,615
Energy Services [Member] | External Customers [Member] |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 503,635 | 441,806
Energy Services [Member] | Intercompany [Member] |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 107 | 194
Energy Holdings [Member] |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 2 | 1
Investment income, interest | 271 | 248
Interest expense, net of capitalized interest | 591 | 714
Income tax provision (benefit) | 1,243 | 1,231
Equity in earnings of affiliates | 3,491 | 3,615
Net financial earnings (loss) | 1,785 | 1,783
Reportable Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Total operating revenues | 725,770 | 633,754
Depreciation and amortization | 11,121 | 9,459
Investment income, interest | 438 | 525
Interest expense, net of capitalized interest | 5,526 | 4,863
Income tax provision (benefit) | 24,145 | 16,164
Net financial earnings (loss) | 35,596 | 45,469
Capital expenditures | 49,465 | 69,329
Retail and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Depreciation and amortization | 191 | 141
Investment income, interest | 1 | 0
Interest expense, net of capitalized interest | 299 | 142
Income tax provision (benefit) | (123) | (59)
Net financial earnings (loss) | (94) | (146)
Capital expenditures | 154 | 89
Retail and Other [Member] | External Customers [Member] |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 10,355 | 8,852
Retail and Other [Member] | Intercompany [Member] |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 263 | 179
Business Intersegment, Eliminations [Member] |  |
Segment Reporting Information [Line Items] |  |
Nonutility | (369) | (374)
Depreciation and amortization | (9) | 0
Investment income, interest | (232) | (235)
Income tax provision (benefit) | (42) | (68)
Equity in earnings of affiliates | (936) | (961)
Net financial earnings (loss) | $ (9) | $ (15)

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