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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, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |
Utility | $ 274,435 | $ 195,729
Nonutility | 401,407 | 258,576
Operating revenues | 675,842 | 454,305
Depreciation and amortization | 30,393 | 27,362
Interest income | 501 | 669
Interest expense, net of capitalized interest | 19,477 | 19,786
Income tax provision (benefit) | 30,807 | 17,441
Impairment of equity method investment | 575 | 2,675
Net financial earnings (loss) | 65,770 | 44,657
Capital expenditures | 164,298 | 109,880
Investments in equity investees | 0 | 286
Energy Services |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 22,100 |
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 666,342 | 444,680
Depreciation and amortization | 30,287 | 27,284
Interest income | 570 | 776
Interest expense, net of capitalized interest | 19,233 | 18,670
Income tax provision (benefit) | 32,006 | 18,049
Net financial earnings (loss) | 64,788 | 44,201
Capital expenditures | 164,219 | 109,194
Operating Segments | Natural Gas Distribution, External Customers |  |
Segment Reporting Information [Line Items] |  |
Utility | 274,435 | 195,729
Operating Segments | Clean Energy Ventures |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 10,183 | 6,370
Operating revenues | 10,183 | 6,370
Depreciation and amortization | 5,233 | 5,433
Interest expense, net of capitalized interest | 5,427 | 5,034
Income tax provision (benefit) | (2,046) | (3,086)
Net financial earnings (loss) | (6,821) | (10,274)
Capital expenditures | 25,380 | 22,335
Operating Segments | Energy Services |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 365,788 | 227,349
Operating revenues | 365,788 | 227,349
Depreciation and amortization | 28 | 42
Interest expense, net of capitalized interest | 675 | 680
Income tax provision (benefit) | 20,505 | 12,122
Net financial earnings (loss) | 17,567 | 1,500
Operating Segments | Storage and Transportation |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 11,584 | 12,447
Operating revenues | 11,584 | 12,447
Depreciation and amortization | 2,133 | 2,640
Interest income | 377 | 694
Interest expense, net of capitalized interest | 2,136 | 3,982
Income tax provision (benefit) | 343 | 646
Impairment of equity method investment | 1,056 | 3,193
Net financial earnings (loss) | 2,962 | 3,508
Capital expenditures | 65,375 | 7,613
Investments in equity investees | 0 | 286
Operating Segments | Natural Gas Distribution |  |
Segment Reporting Information [Line Items] |  |
Operating revenues | 274,435 | 195,729
Depreciation and amortization | 22,893 | 19,169
Interest income | 193 | 82
Interest expense, net of capitalized interest | 10,995 | 8,974
Income tax provision (benefit) | 13,204 | 8,367
Net financial earnings (loss) | 51,080 | 49,467
Capital expenditures | 73,464 | 79,246
Intercompany |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 99 | 167
Intercompany | Natural Gas Distribution, External Customers |  |
Segment Reporting Information [Line Items] |  |
Utility | 337 | 0
Intercompany | Energy Services |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 3,456 | 2,128
Intercompany | Storage and Transportation |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 559 | 657
Home Services and Other |  |
Segment Reporting Information [Line Items] |  |
Nonutility | 13,852 | 12,410
Operating revenues | 13,852 | 12,410
Depreciation and amortization | 204 | 260
Interest income | 155 | 132
Interest expense, net of capitalized interest | 244 | 1,116
Income tax provision (benefit) | 246 | 118
Net financial earnings (loss) | 447 | (62)
Capital expenditures | 79 | 686
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Nonutility | (4,451) | (2,952)
Depreciation and amortization | (98) | (182)
Interest income | (224) | (239)
Income tax provision (benefit) | (1,445) | (726)
Impairment of equity method investment | (481) | (518)
Net financial earnings (loss) | $ 535 | $ 518

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