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Discontinued operations - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2024
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Minimum          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Transition services period       18 months  
Maximum          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Transition services period       2 years  
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        
Separation related costs   $ 39 $ 1,900 $ 586 $ 9,200
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Everus | Cash Received, TSA          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Discontinued operation, amount of continuing cash flows after disposal   1,300   6,800  
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Everus | Cash Paid, TSA          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Discontinued operation, amount of continuing cash flows after disposal   $ 17   $ 42