Annual report pursuant to Section 13 and 15(d)

Contracts Receivable Including Retainage, Net - Rollforward of Alllowance (Details)

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Contracts Receivable Including Retainage, Net - Rollforward of Alllowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]    
Balance at beginning of period $ 1,734 $ 1,039
Charged to bad debt expense 604 1,445
Write-off of contracts receivable including retainage (1,240) (750)
Balance at end of period $ 1,098 $ 1,734