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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, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |
Utility | $ 400,500 | $ 463,474 | $ 757,909 | $ 737,909
Nonutility | 243,527 | 448,842 | 609,685 | 850,249
Operating revenues | 644,027 | 912,316 | 1,367,594 | 1,588,158
Depreciation and amortization | 38,090 | 31,435 | 74,773 | 61,828
Interest income | 2,236 | 488 | 4,195 | 989
Interest expense, net of capitalized interest | 30,261 | 18,926 | 59,752 | 38,403
Income tax provision (benefit) | 30,586 | 28,810 | 63,564 | 59,617
Equity in earnings of affiliates | 1,131 | 769 | 2,077 | 1,344
Net financial earnings (loss) | 112,310 | 130,206 | 222,594 | 195,976
Capital expenditures | 117,188 | 137,012 | 263,111 | 301,310
Return of capital from equity investees | 0 | (4,000) | 0 | (4,000)
Energy Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 9,500 | 10,300 | 29,500 | 32,400
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 632,861 | 901,626 | 1,352,019 | 1,567,968
Depreciation and amortization | 37,866 | 31,258 | 74,331 | 61,545
Interest income | 2,440 | 572 | 4,523 | 1,142
Interest expense, net of capitalized interest | 30,072 | 18,801 | 59,441 | 38,034
Income tax provision (benefit) | 27,431 | 27,661 | 61,984 | 59,667
Net financial earnings (loss) | 114,893 | 130,857 | 224,751 | 195,645
Capital expenditures | 116,428 | 136,849 | 262,211 | 301,068
Operating Segments | Natural Gas Distribution, External Customers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Utility | 400,500 | 463,474 | 757,909 | 737,909
Operating Segments | Clean Energy Ventures, External Customers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 14,406 | 11,827 | 27,198 | 22,010
Operating Segments | Energy Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 196,553 | 411,069 | 509,952 | 776,857
Operating revenues | 196,553 | 411,069 | 509,952 | 776,857
Depreciation and amortization | 62 | 32 | 119 | 60
Interest income | 380 | 0 | 649 | 0
Interest expense, net of capitalized interest | 2,749 | 795 | 5,807 | 1,470
Income tax provision (benefit) | 5,916 | (790) | 25,980 | 19,715
Net financial earnings (loss) | 21,125 | 29,940 | 73,658 | 47,507
Operating Segments | Storage and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 19,303 | 12,805 | 45,017 | 24,389
Operating revenues | 19,303 | 12,805 | 45,017 | 24,389
Depreciation and amortization | 6,020 | 2,571 | 11,962 | 4,704
Interest income | 1,684 | 381 | 3,085 | 758
Interest expense, net of capitalized interest | 6,128 | 1,847 | 12,835 | 3,983
Income tax provision (benefit) | 596 | 714 | 2,539 | 1,057
Equity in earnings of affiliates | 977 | 1,256 | 1,886 | 2,312
Net financial earnings (loss) | 2,450 | 4,625 | 8,693 | 7,587
Capital expenditures | 10,122 | 43,673 | 29,841 | 109,048
Return of capital from equity investees | 0 | (4,000) | 0 | (4,000)
Operating Segments | Natural Gas Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 400,500 | 463,474 | 757,909 | 737,909
Depreciation and amortization | 25,319 | 23,344 | 50,209 | 46,237
Interest income | 376 | 191 | 789 | 384
Interest expense, net of capitalized interest | 13,879 | 10,764 | 27,588 | 21,759
Income tax provision (benefit) | 23,924 | 29,689 | 38,307 | 42,893
Net financial earnings (loss) | 100,697 | 102,783 | 155,361 | 153,863
Capital expenditures | 92,600 | 52,000 | 174,671 | 125,464
Operating Segments | Clean Energy Ventures |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating revenues | 14,406 | 11,827 | 27,198 | 22,010
Depreciation and amortization | 6,465 | 5,311 | 12,041 | 10,544
Interest expense, net of capitalized interest | 7,316 | 5,395 | 13,211 | 10,822
Income tax provision (benefit) | (3,005) | (1,952) | (4,842) | (3,998)
Net financial earnings (loss) | (9,379) | (6,491) | (12,961) | (13,312)
Capital expenditures | 13,706 | 41,176 | 57,699 | 66,556
Intercompany |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 183 | 81 | 196 | 180
Intercompany | Natural Gas Distribution, External Customers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Utility | 338 | 338 | 675 | 675
Intercompany | Energy Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 177 | 1,576 | 8,560 | 5,032
Intercompany | Storage and Transportation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 1,584 | 537 | 2,708 | 1,096
Home Services and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | 13,265 | 13,141 | 27,518 | 26,993
Operating revenues | 13,265 | 13,141 | 27,518 | 26,993
Depreciation and amortization | 224 | 203 | 442 | 407
Interest income | 734 | 147 | 1,388 | 302
Interest expense, net of capitalized interest | 189 | 125 | 311 | 369
Income tax provision (benefit) | 488 | 256 | 705 | 502
Net financial earnings (loss) | 813 | 451 | 784 | 898
Capital expenditures | 760 | 163 | 900 | 242
Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Nonutility | (2,282) | (2,532) | (12,139) | (6,983)
Depreciation and amortization | 0 | (26) | 0 | (124)
Interest income | (938) | (231) | (1,716) | (455)
Income tax provision (benefit) | 2,667 | 893 | 875 | (552)
Equity in earnings of affiliates | 154 | (487) | 191 | (968)
Net financial earnings (loss) | $ (3,396) | $ (1,102) | $ (2,941) | $ (567)

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