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Contracts Receivable Including Retainage, net
 9 Months Ended
Jun. 30, 2022
Contractors [Abstract]  
Contracts Receivable Including Retainage, net Contracts Receivable Including Retainage, net
Contracts receivable including retainage, net consisted of the following at June 30, 2022 and September 30, 2021 (in thousands):
June 30, 2022September 30, 2021
(unaudited)
Contracts receivable$205,092 $132,456 
Retainage35,777 27,640 
240,869 160,096 
Allowance for doubtful accounts(879)(1,926)
Contracts receivable including retainage, net$239,990 $158,170 
Retainage receivables have been billed but are not due until contract completion and acceptance by the customer.