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, 2018
Sep. 30, 2017
Sep. 30, 2016
Contractors [Abstract]      
Contracts receivable $ 104,541 $ 109,538  
Retainage 16,848 13,180  
Contracts receivable including retainage, gross 121,389 122,718  
Allowance for doubtful accounts (1,098) (1,734) $ (1,039)
Contracts receivable including retainage, net $ 120,291 $ 120,984