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REPORTING SEGMENT AND OTHER OPERATIONS DATA - RECONCILIATION OF SEGMENT INCOME TO CONSOLIDATED (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |
Utility | $ 357,409 | $ 274,435
Nonutility | 366,158 | 401,407
Operating revenues | 723,567 | 675,842
Depreciation and amortization | 36,683 | 30,393
Interest income | 1,959 | 501
Interest expense, net of capitalized interest | 29,491 | 19,477
Income tax provision (benefit) | 32,978 | 30,807
Equity in earnings of affiliates | 946 | 575
Net financial earnings (loss) | 110,284 | 65,770
Capital expenditures | 145,923 | 164,298
Energy Services |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 20,000 | 22,100
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 719,158 | 666,342
Depreciation and amortization | 36,465 | 30,287
Interest income | 2,083 | 570
Interest expense, net of capitalized interest | 29,369 | 19,233
Income tax provision (benefit) | 34,553 | 32,006
Net financial earnings (loss) | 109,858 | 64,788
Capital expenditures | 145,783 | 164,219
Operating Segments | Natural Gas Distribution, External Customers |  |
Segment Reporting Information [Line Items] |  |
Utility | 357,409 | 274,435
Operating Segments | Clean Energy Ventures, External Customers |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 12,792 | 10,183
Operating Segments | Energy Services |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 313,399 | 365,788
Operating revenues | 313,399 | 365,788
Depreciation and amortization | 57 | 28
Interest income | 269 | 0
Interest expense, net of capitalized interest | 3,058 | 675
Income tax provision (benefit) | 20,064 | 20,505
Net financial earnings (loss) | 52,533 | 17,567
Operating Segments | Storage and Transportation |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 25,714 | 11,584
Operating revenues | 25,714 | 11,584
Depreciation and amortization | 5,942 | 2,133
Interest income | 1,401 | 377
Interest expense, net of capitalized interest | 6,707 | 2,136
Income tax provision (benefit) | 1,943 | 343
Equity in earnings of affiliates | 909 | 1,056
Net financial earnings (loss) | 6,243 | 2,962
Capital expenditures | 19,719 | 65,375
Operating Segments | Natural Gas Distribution |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 357,409 | 274,435
Depreciation and amortization | 24,890 | 22,893
Interest income | 413 | 193
Interest expense, net of capitalized interest | 13,709 | 10,995
Income tax provision (benefit) | 14,383 | 13,204
Net financial earnings (loss) | 54,664 | 51,080
Capital expenditures | 82,071 | 73,464
Operating Segments | Clean Energy Ventures |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 12,792 | 10,183
Depreciation and amortization | 5,576 | 5,233
Interest expense, net of capitalized interest | 5,895 | 5,427
Income tax provision (benefit) | (1,837) | (2,046)
Net financial earnings (loss) | (3,582) | (6,821)
Capital expenditures | 43,993 | 25,380
Intercompany |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 13 | 99
Intercompany | Natural Gas Distribution, External Customers |  |
Segment Reporting Information [Line Items] |  |
Utility | 337 | 337
Intercompany | Energy Services |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 8,383 | 3,456
Intercompany | Storage and Transportation |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 1,124 | 559
Home Services and Other |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 14,253 | 13,852
Operating revenues | 14,253 | 13,852
Depreciation and amortization | 218 | 204
Interest income | 654 | 155
Interest expense, net of capitalized interest | 122 | 244
Income tax provision (benefit) | 217 | 246
Net financial earnings (loss) | (29) | 447
Capital expenditures | 140 | 79
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Nonutility | (9,857) | (4,451)
Depreciation and amortization | 0 | (98)
Interest income | (778) | (224)
Income tax provision (benefit) | (1,792) | (1,445)
Equity in earnings of affiliates | 37 | (481)
Net financial earnings (loss) | $ 455 | $ 535

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