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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Loss Contingencies [Line Items]    
Loss Contingency, Discounted Amount of Insurance-related Assessment Liability $ 7,726 $ 7,693
Letters of Credit Outstanding, Amount 4,166  
Estimated cost of completion of bonded projects 151,186  
Purchase Commitment, Remaining Minimum Amount Committed 0  
Loss Contingency Accrual 10,451  
Loss Contingency, Loss in Period 3,095  
Insurance Related [Member]    
Loss Contingencies [Line Items]    
Letters of Credit Outstanding, Amount $ 4,166 $ 3,878