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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |
Utility | $ 310,167 | $ 297,220 | $ 505,896 | $ 516,843
Nonutility | 492,020 | 342,394 | 750,596 | 737,807
Total operating revenues | 802,187 | 639,614 | 1,256,492 | 1,254,650
Depreciation and amortization | 26,848 | 27,516 | 54,210 | 52,153
Interest income | 1,057 | 1,721 | 1,726 | 1,907
Interest expense, net of capitalized interest | 20,153 | 19,203 | 39,939 | 35,273
Income tax provision (benefit) | 39,057 | 16,284 | 56,498 | 32,755
Equity in earnings of affiliates | 2,804 | 3,589 | 5,479 | 6,978
Net financial earnings (loss) | 170,604 | 84,291 | 215,261 | 119,222
Capital expenditures | 136,007 | 101,166 | 245,887 | 227,349
Investments in equity investees | 196 | 757 | 482 | 1,266
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total operating revenues | 793,138 | 627,992 | 1,237,818 | 1,233,314
Depreciation and amortization | 26,537 | 27,127 | 53,821 | 51,970
Interest income | 1,167 | 2,273 | 1,943 | 3,114
Interest expense, net of capitalized interest | 18,425 | 18,866 | 37,095 | 35,238
Income tax provision (benefit) | 36,909 | 14,224 | 54,958 | 30,479
Net financial earnings (loss) | 172,908 | 84,252 | 217,109 | 117,811
Capital expenditures | 135,882 | 101,277 | 245,076 | 227,334
Operating Segments | Natural Gas Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Utility | 310,167 | 297,220 | 505,896 | 516,843
Total operating revenues | 310,167 | 297,220 | 505,896 | 516,843
Depreciation and amortization | 19,475 | 18,100 | 38,644 | 34,917
Interest income | 76 | 136 | 158 | 243
Interest expense, net of capitalized interest | 9,006 | 7,473 | 17,980 | 15,305
Income tax provision (benefit) | 15,622 | 19,702 | 23,989 | 28,337
Net financial earnings (loss) | 80,541 | 86,336 | 130,008 | 130,192
Capital expenditures | 97,239 | 72,042 | 176,485 | 149,839
Operating Segments | Clean Energy Ventures |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 6,476 | 5,995 | 12,846 | 12,207
Total operating revenues | 6,476 | 5,995 | 12,846 | 12,207
Depreciation and amortization | 4,685 | 6,603 | 10,118 | 12,919
Interest income | 240 | 0 | 240 | 0
Interest expense, net of capitalized interest | 5,266 | 4,835 | 10,300 | 9,327
Income tax provision (benefit) | (2,714) | (4,134) | (5,800) | (7,968)
Net financial earnings (loss) | (8,872) | (8,829) | (19,146) | (17,008)
Capital expenditures | 18,549 | 24,087 | 40,884 | 69,786
Operating Segments | Energy Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 459,766 | 313,959 | 687,115 | 682,263
Total operating revenues | 459,766 | 313,959 | 687,115 | 682,263
Depreciation and amortization | 13 | 27 | 55 | 56
Interest income | 0 | 52 | 0 | 89
Interest expense, net of capitalized interest | 575 | 937 | 1,255 | 2,163
Income tax provision (benefit) | 23,128 | (2,449) | 35,250 | 8,303
Net financial earnings (loss) | 96,528 | 2,487 | 98,028 | (2,635)
Operating Segments | Storage and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 13,257 | 10,401 | 25,704 | 18,806
Total operating revenues | 13,257 | 10,401 | 25,704 | 18,806
Depreciation and amortization | 2,364 | 2,397 | 5,004 | 4,078
Interest income | 851 | 2,085 | 1,545 | 2,782
Interest expense, net of capitalized interest | 3,578 | 5,621 | 7,560 | 8,443
Income tax provision (benefit) | 873 | 1,105 | 1,519 | 1,807
Equity in earnings of affiliates | 3,386 | 3,921 | 6,579 | 7,585
Net financial earnings (loss) | 4,711 | 4,258 | 8,219 | 7,262
Capital expenditures | 20,094 | 5,148 | 27,707 | 7,709
Investments in equity investees | 196 | 757 | 482 | 1,266
Intercompany |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 252 | 326 | 419 | 741
Intercompany | Energy Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 2,803 | (258) | 4,931 | 1,853
Intercompany | Storage and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 669 | 675 | 1,326 | 1,342
Home Services and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 12,521 | 12,039 | 24,931 | 24,531
Total operating revenues | 12,521 | 12,039 | 24,931 | 24,531
Depreciation and amortization | 227 | 250 | 487 | 496
Interest income | 127 | 208 | 259 | 699
Interest expense, net of capitalized interest | 1,728 | 565 | 2,844 | 837
Income tax provision (benefit) | (59) | 1,956 | 59 | 2,175
Net financial earnings (loss) | 747 | 148 | 685 | 1,257
Capital expenditures | 125 | (111) | 811 | 15
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | (3,724) | (743) | (6,676) | (3,936)
Depreciation and amortization | 84 | 139 | (98) | (313)
Interest income | (237) | (760) | (476) | (1,906)
Interest expense, net of capitalized interest | 0 | (228) | 0 | (802)
Income tax provision (benefit) | 2,207 | 104 | 1,481 | 101
Equity in earnings of affiliates | (582) | (332) | (1,100) | (607)
Net financial earnings (loss) | $ (3,051) | $ (109) | $ (2,533) | $ 154

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