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Contracts Receivable Including Retainage, net
 6 Months Ended
Mar. 31, 2022
Contractors [Abstract]  
Contracts Receivable Including Retainage, net Contracts Receivable Including Retainage, net
Contracts receivable including retainage, net consisted of the following at March 31, 2022 and September 30, 2021 (in thousands):
March 31, 2022September 30, 2021
(unaudited)
Contracts receivable$143,583 $132,456 
Retainage29,242 27,640 
172,825 160,096 
Allowance for doubtful accounts(2,086)(1,926)
Contracts receivable including retainage, net$170,739 $158,170 
Retainage receivables have been billed, but are not due until contract completion and acceptance by the customer.