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BUSINESS SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Utility |  | $ 242,536 | $ 374,703 | $ 394,142 | $ 583,430
Nonutility |  | 331,657 | 638,387 | 624,309 | 1,253,784
Total operating revenues |  | 574,193 | 1,013,090 | 1,018,451 | 1,837,214
Depreciation and amortization |  | 17,744 | 15,204 | 34,226 | 29,590
Interest income | [1] | 53 | 246 | 123 | 336
Interest expense, net of capitalized interest |  | 7,369 | 6,483 | 14,146 | 13,678
Income tax provision (benefit) |  | 17,840 | 20,144 | 26,197 | 61,011
Equity in earnings of affiliates |  | 2,402 | 3,587 | 4,808 | 6,382
Net financial earnings |  | 77,880 | 99,143 | 127,512 | 154,253
Capital expenditures |  | 73,514 | 66,318 | 168,357 | 158,422
Investments in equity investees |  | 3,102 | 717 | $ 5,948 | $ 1,264
Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage to total operating revenues |  |  |  | 2.90% | 4.40%
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total operating revenues |  | 570,156 | 1,060,975 | $ 1,008,249 | $ 1,879,625
Depreciation and amortization |  | 17,499 | 14,968 | 33,871 | 29,128
Interest income | [1] | 510 | 287 | 914 | 616
Interest expense, net of capitalized interest |  | 7,540 | 6,547 | 14,431 | 13,736
Income tax provision (benefit) |  | 18,130 | 20,478 | 27,241 | 62,292
Net financial earnings |  | 80,000 | 100,524 | 130,433 | 156,274
Capital expenditures |  | 73,242 | 66,268 | 167,288 | 158,361
Operating Segments [Member] | Natural Gas Distribution [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | 11,598 | 10,647 | 22,836 | 21,192
Interest income | [1] | 60 | 10 | 128 | 100
Interest expense, net of capitalized interest |  | 4,690 | 4,388 | 9,278 | 8,997
Income tax provision (benefit) |  | 22,710 | 23,778 | 36,573 | 37,944
Net financial earnings |  | 48,961 | 48,594 | 79,531 | 76,780
Capital expenditures |  | 47,366 | 33,243 | 96,406 | 69,991
Operating Segments [Member] | Natural Gas Distribution [Member] | External Customers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Utility |  | 242,536 | 374,703 | 394,142 | 583,430
Operating Segments [Member] | Energy Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | 23 | 23 | 46 | 45
Interest income | [1] | 0 | 13 | 72 | 13
Interest expense, net of capitalized interest |  | 168 | 288 | 376 | 801
Income tax provision (benefit) |  | 7,805 | 3,923 | 13,000 | 49,800
Net financial earnings |  | 17,005 | 36,316 | 27,019 | 52,752
Operating Segments [Member] | Energy Services [Member] | External Customers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Nonutility | [2] | 316,703 | 626,107 | 592,885 | 1,226,669
Operating Segments [Member] | Energy Services [Member] | Intercompany [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Nonutility |  | 3,255 | 56,097 | 5,766 | 59,223
Operating Segments [Member] | Clean Energy Ventures [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | 5,876 | 4,297 | 10,986 | 7,888
Interest income | [1] | 0 | 22 | 0 | 22
Interest expense, net of capitalized interest |  | 2,552 | 1,661 | 4,605 | 3,478
Income tax provision (benefit) |  | (13,915) | (9,042) | (25,502) | (28,763)
Net financial earnings |  | 11,806 | 13,010 | 19,311 | 22,018
Capital expenditures |  | 25,876 | 33,025 | 70,882 | 88,370
Operating Segments [Member] | Clean Energy Ventures [Member] | External Customers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Nonutility |  | 7,662 | 4,068 | 15,456 | 10,303
Operating Segments [Member] | Midstream [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | 2 | 1 | 3 | 3
Interest income | [1] | 450 | 242 | 714 | 481
Interest expense, net of capitalized interest |  | 130 | 210 | 172 | 460
Income tax provision (benefit) |  | 1,530 | 1,819 | 3,170 | 3,311
Equity in earnings of affiliates |  | 3,508 | 4,581 | 7,053 | 8,356
Net financial earnings |  | 2,228 | 2,604 | 4,572 | 4,724
Investments in equity investees |  | 3,102 | 717 | 5,948 | 1,264
Corporate, Non-Segment [Member] | Home Services and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | 237 | 238 | 464 | 476
Interest income | [1] | 123 | 201 | 160 | 201
Interest expense, net of capitalized interest |  | 105 | (64) | 105 | (58)
Income tax provision (benefit) |  | (1,456) | (972) | (1,744) | (1,424)
Net financial earnings |  | (2,040) | (1,359) | (2,623) | (1,951)
Capital expenditures |  | 272 | 50 | 1,069 | 61
Corporate, Non-Segment [Member] | Home Services and Other [Member] | External Customers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Nonutility |  | 7,292 | 8,212 | 15,968 | 16,812
Corporate, Non-Segment [Member] | Home Services and Other [Member] | Intercompany [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Nonutility |  | 639 | 375 | 1,536 | 786
Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Nonutility |  | (3,894) | (56,472) | (7,302) | (60,009)
Depreciation and amortization |  | 8 | (2) | (109) | (14)
Interest income | [1] | (580) | (242) | (951) | (481)
Interest expense, net of capitalized interest |  | (276) | 0 | (390) | 0
Income tax provision (benefit) |  | 1,166 | 638 | 700 | 143
Equity in earnings of affiliates |  | (1,106) | (994) | (2,245) | (1,974)
Net financial earnings |  | $ (80) | $ (22) | $ (298) | $ (70)
[1] | Included in other income, net on the Unaudited Condensed Consolidated Statements of Operations.
[2] | Includes sales to Canada, which accounted for 2.9 and 4.4 percent of total operating revenues during the six months ended March 31, 2016 and 2015.

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