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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, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  |  | $ 594,346 | $ 781,970 | $ 819,415
Nonutility |  |  |  |  |  |  |  |  |  | 1,286,559 | 1,952,017 | 2,918,730
Total operating revenues |  | $ 469,241 | $ 393,213 | $ 574,193 | $ 444,258 | $ 438,306 | $ 458,467 | $ 1,013,090 | $ 824,124 | 1,880,905 | 2,733,987 | 3,738,145
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 72,748 | 61,399 | 52,742
Interest income | [1] |  |  |  |  |  |  |  |  | 128 | 580 | 1,222
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 31,044 | 27,721 | 25,463
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 23,530 | 59,724 | 51,840
Equity in earnings of affiliates |  |  |  |  |  |  |  |  |  | 9,515 | 13,409 | 10,532
Net financial earnings |  |  |  |  |  |  |  |  |  | 138,085 | 151,503 | 176,857
Capital expenditures |  |  |  |  |  |  |  |  |  | 356,092 | 320,086 | 289,288
Investments in equity investees |  |  |  |  |  |  |  |  |  | $ 11,176 | $ 5,780 | $ 555
CANADA |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage to total operating revenues |  |  |  |  |  |  |  |  |  | 2.00% | 3.70% | 3.30%
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  |  | $ 1,845,139 | $ 2,748,790 | $ 3,764,807
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 71,893 | 60,478 | 51,900
Interest income | [1] |  |  |  |  |  |  |  |  | 1,737 | 1,777 | 2,171
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 31,616 | 28,095 | 25,104
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 21,519 | 58,468 | 49,122
Net financial earnings |  |  |  |  |  |  |  |  |  | 135,837 | 148,290 | 174,091
Capital expenditures |  |  |  |  |  |  |  |  |  | 354,196 | 319,877 | 288,109
Operating Segments | Natural Gas Distribution |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 47,828 | 43,085 | 40,540
Interest income | [1] |  |  |  |  |  |  |  |  | 115 | 336 | 999
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 19,930 | 18,534 | 16,683
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 34,951 | 39,544 | 39,374
Net financial earnings |  |  |  |  |  |  |  |  |  | 76,104 | 76,287 | 74,204
Capital expenditures |  |  |  |  |  |  |  |  |  | 205,133 | 168,875 | 152,566
Operating Segments | Natural Gas Distribution | External customers |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Utility |  |  |  |  |  |  |  |  |  | 594,346 | 781,970 | 819,415
Operating Segments | Clean Energy Ventures |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 23,971 | 17,297 | 11,295
Interest income | [1] |  |  |  |  |  |  |  |  | 0 | 26 | 0
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 10,304 | 7,635 | 5,300
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | (26,592) | (26,968) | (21,937)
Net financial earnings |  |  |  |  |  |  |  |  |  | 28,393 | 20,101 | 12,654
Capital expenditures |  |  |  |  |  |  |  |  |  | 149,063 | 151,002 | 135,543
Operating Segments | Clean Energy Ventures | External customers |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | 53,540 | 32,513 | 14,575
Operating Segments | Energy Services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 88 | 90 | 59
Interest income | [1] |  |  |  |  |  |  |  |  | 98 | 438 | 222
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 1,095 | 1,209 | 1,725
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 7,030 | 39,043 | 26,458
Net financial earnings |  |  |  |  |  |  |  |  |  | 21,934 | 42,122 | 79,735
Operating Segments | Energy Services | External customers |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility | [2] |  |  |  |  |  |  |  |  | 1,187,754 | 1,872,781 | 2,858,703
Operating Segments | Energy Services | Intercompany |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | 9,499 | 61,526 | 72,114
Operating Segments | Midstream |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 6 | 6 | 6
Interest income | [1] |  |  |  |  |  |  |  |  | 1,524 | 977 | 950
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 287 | 717 | 1,396
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 6,130 | 6,849 | 5,227
Equity in earnings of affiliates |  |  |  |  |  |  |  |  |  | 13,936 | 17,487 | 14,078
Net financial earnings |  |  |  |  |  |  |  |  |  | 9,406 | 9,780 | 7,498
Investments in equity investees |  |  |  |  |  |  |  |  |  | 11,176 | 5,780 | 555
Home Services and Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 981 | 952 | 846
Interest income | [1] |  |  |  |  |  |  |  |  | 397 | 217 | 1
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | 252 | 49 | 359
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 1,387 | 1,551 | 2,460
Net financial earnings |  |  |  |  |  |  |  |  |  | 2,882 | 3,420 | 2,798
Capital expenditures |  |  |  |  |  |  |  |  |  | 1,896 | 209 | 1,179
Home Services and Other | External customers |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | 45,265 | 46,723 | 45,452
Home Services and Other | Intercompany |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | 3,232 | 1,980 | 1,235
Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonutility |  |  |  |  |  |  |  |  |  | (12,731) | (63,506) | (73,349)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (126) | (31) | (4)
Interest income | [1] |  |  |  |  |  |  |  |  | (2,006) | (1,414) | (950)
Interest expense, net of capitalized interest |  |  |  |  |  |  |  |  |  | (824) | (423) | 0
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  | 624 | (295) | 258
Equity in earnings of affiliates |  |  |  |  |  |  |  |  |  | (4,421) | (4,078) | (3,546)
Net financial earnings |  |  |  |  |  |  |  |  |  | $ (634) | $ (207) | $ (32)
[1] | Included in other income, net on the Consolidated Statements of Operations.
[2] | Includes sales to Canada, which accounted for 2, 3.7 and 3.3 percent of total operating revenues during fiscal 2016, 2015 and 2014, respectively.

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