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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
Mar. 31, 2025
Sep. 30, 2024
Finite-Lived Intangible Assets [Line Items]    
Total $ 5,554 $ 6,932
Backlog and customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 7,400 671,700
Accumulated Amortization (1,800) (664,800)
Total $ 5,600 $ 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