Annual report pursuant to Section 13 and 15(d)

Contracts Receivable Including Retainage, net - Schedule of Contracts Receivable (Detail)

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Contracts Receivable Including Retainage, net - Schedule of Contracts Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Contractors [Abstract]      
Contracts receivable $ 112,197 $ 121,050  
Retainage 21,013 19,835  
Contracts receivable including retainage, gross 133,210 140,885  
Allowance for doubtful accounts (1,440) (1,003) $ (1,098)
Contracts receivable including retainage, net $ 131,770 $ 139,882