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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)