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Contracts Receivable Including Retainage, net
 6 Months Ended
Mar. 31, 2020
Contractors [Abstract]  
Contracts Receivable Including Retainage, net Contracts Receivable Including Retainage, net
Contracts receivable including retainage, net consisted of the following at March 31, 2020 and September 30, 2019 (in thousands):
March 31, 2020September 30, 2019
(unaudited)
Contracts receivable$104,686  $121,050  
Retainage19,387  19,835  
124,073  140,885  
Allowance for doubtful accounts(1,176) (1,003) 
Contracts receivable including retainage, net$122,897  $139,882  
Retainage receivables have been billed, but are not due until contract completion and acceptance by the customer.