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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Loss Contingencies [Line Items]    
Loss Contingency, Discounted Amount of Insurance-related Assessment Liability $ 7,693 $ 5,787
Liability for Claims and Claims Adjustment Expense 17 8
Letters of Credit Outstanding, Amount 4,077  
Estimated cost of completion of bonded projects 107,556  
Purchase Commitment, Remaining Minimum Amount Committed 9,726  
Loss Contingency Accrual 10,451  
Loss Contingency, Loss in Period 3,095  
Insurance Related [Member]    
Loss Contingencies [Line Items]    
Letters of Credit Outstanding, Amount $ 3,878 $ 4,327