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Basis of presentation (Details)
$ in Thousands
3 Months Ended
Oct. 31, 2024
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Selling, General and Administrative Expense   $ (111,047) $ (107,614)
Electric fuel and purchased power   $ 43,748 39,723
Revision of Prior Period, Error Correction, Adjustment      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Selling, General and Administrative Expense     7,100
Electric fuel and purchased power     $ 7,100
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Everus      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Stock split, conversion ratio 0.25