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BUSINESS SEGMENT AND OTHER OPERATIONS DATA, RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]                      
Utility                 $ 781,970 $ 819,415 $ 787,987
Nonutility                 1,952,017 2,918,730 2,410,081
Total operating revenues $ 438,306 $ 458,467 $ 1,013,090 $ 824,124 $ 591,914 $ 688,257 $ 1,579,569 $ 878,405 2,733,987 3,738,145 3,198,068
Depreciation and amortization                 61,399 52,742 47,310
Interest income [1]                 580 1,222 837
Interest expense, net of capitalized interest                 27,721 25,463 23,979
Income tax provision (benefit)                 59,724 51,840 35,575
Equity in earnings of affiliates                 13,409 10,532 10,349
Net financial earnings                 151,503 176,857 113,681
Capital expenditures                 320,086 289,288 197,250
Investments in equity investees                 $ 5,780 $ 555 $ 0
Canada                      
Segment Reporting Information [Line Items]                      
Percentage to total operating revenues                 3.70% 3.30% 5.90%
Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total operating revenues                 $ 2,748,790 $ 3,764,807 $ 3,156,553
Depreciation and amortization                 60,478 51,900 46,526
Interest income [1]                 1,777 2,171 1,719
Interest expense, net of capitalized interest                 28,095 25,104 22,878
Income tax provision (benefit)                 58,468 49,122 33,197
Net financial earnings                 148,290 174,091 110,416
Capital expenditures                 319,877 288,109 196,208
Operating Segments [Member] | Natural Gas Distribution [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 43,085 40,540 37,999
Interest income [1]                 336 999 653
Interest expense, net of capitalized interest                 18,534 16,683 14,995
Income tax provision (benefit)                 39,544 39,374 35,399
Net financial earnings                 76,287 74,204 73,846
Capital expenditures                 168,875 152,566 137,083
Operating Segments [Member] | Natural Gas Distribution [Member] | External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Utility                 781,970 819,415 787,987
Operating Segments [Member] | Energy Services [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 90 59 44
Interest income [1]                 438 222 1
Interest expense, net of capitalized interest                 1,209 1,725 2,534
Income tax provision (benefit)                 39,043 26,458 10,516
Net financial earnings                 42,122 79,735 19,311
Operating Segments [Member] | Energy Services [Member] | External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Nonutility [2]                 1,872,781 2,858,703 2,351,084
Operating Segments [Member] | Energy Services [Member] | Intercompany [Member]                      
Segment Reporting Information [Line Items]                      
Nonutility                 61,526 72,114 5,494
Operating Segments [Member] | Clean Energy Ventures [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 17,297 11,295 8,477
Interest income [1]                 26 0 0
Interest expense, net of capitalized interest                 7,635 5,300 3,387
Income tax provision (benefit)                 (26,968) (21,937) (17,711)
Net financial earnings                 20,101 12,654 10,060
Capital expenditures                 151,002 135,543 59,125
Operating Segments [Member] | Clean Energy Ventures [Member] | External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Nonutility                 32,513 14,575 11,988
Operating Segments [Member] | Midstream [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 6 6 6
Interest income [1]                 977 950 1,065
Interest expense, net of capitalized interest                 717 1,396 1,962
Income tax provision (benefit)                 6,849 5,227 4,993
Equity in earnings of affiliates                 17,487 14,078 13,868
Net financial earnings                 9,780 7,498 7,199
Investments in equity investees                 5,780 555 0
Operating Segments [Member] | Home Services and Other [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 952 846 786
Interest income [1]                 217 1 2
Interest expense, net of capitalized interest                 49 359 1,101
Income tax provision (benefit)                 1,551 2,460 2,550
Net financial earnings                 3,420 2,798 3,292
Capital expenditures                 209 1,179 1,042
Operating Segments [Member] | Home Services and Other [Member] | External Customers [Member]                      
Segment Reporting Information [Line Items]                      
Nonutility                 46,723 45,452 47,009
Operating Segments [Member] | Home Services and Other [Member] | Intercompany [Member]                      
Segment Reporting Information [Line Items]                      
Nonutility                 1,980 1,235 945
Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Nonutility                 (63,506) (73,349) (6,439)
Depreciation and amortization                 (31) (4) (2)
Interest income [1]                 (1,414) (950) (884)
Interest expense, net of capitalized interest                 (423) 0 0
Income tax provision (benefit)                 (295) 258 (172)
Equity in earnings of affiliates                 (4,078) (3,546) (3,519)
Net financial earnings                 $ (207) $ (32) $ (27)
[1] Included in other income, net on the Consolidated Statement of Operations.
[2] Includes sales to Canada, which accounted for 3.7, 3.3 and 5.9 percent of total operating revenues during fiscal 2015, 2014 and 2013, respectively.