Annual report pursuant to Section 13 and 15(d)

Contracts Receivable Including Retainage, net - Rollforward of Allowance (Detail)

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Contracts Receivable Including Retainage, net - Rollforward of Allowance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at beginning of period $ 1,098 $ 1,734
Charged to bad debt expense 995 604
Write-off of contracts receivable including retainage (1,090) (1,240)
Balance at end of period $ 1,003 $ 1,098