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Discontinued Operations, Goodwill and Intangible Assets - Schedule of Gross Amount and Accumulated Amortization of Acquired Identifiable Intangible Assets with Finite Useful Lives (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]    
Total $ 5,183 $ 6,932
Backlog and Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 7,400 671,700
Accumulated Amortization (2,200) (664,800)
Total $ 5,200 $ 6,900
Backlog and Customer relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Amortization Period (in years) 1 year  
Backlog and Customer relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Amortization Period (in years) 11 years