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Contracts Receivable Including Retainage, net
 12 Months Ended
Sep. 30, 2022
Contractors [Abstract]  
Contracts Receivable Including Retainage, net Contracts Receivable Including Retainage, net
Contracts receivable including retainage, net consisted of the following at September 30, 2022 and 2021 (in thousands):
September 30,
20222021
Contracts receivable$221,566 $132,456 
Retainage44,253 27,640 
265,819 160,096 
Allowance for doubtful accounts(612)(1,926)
Contracts receivable including retainage, net$265,207 $158,170 
The following is a summary of changes in the allowance for doubtful accounts balance during the fiscal years ended September 30, 2022 and 2021 (in thousands):
For the Fiscal Year Ended 
September 30,
20222021
Balance at beginning of period$1,926 $1,440 
Charged (credited) to bad debt expense(947)784 
Write-off of contracts receivable including retainage(367)(298)
Balance at end of period$612 $1,926 
Retainage receivables have been billed and the Company has an unconditional right to payment, but are not due until satisfactory contract completion and acceptance by the customer.