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Accounts Receivable
 12 Months Ended
Sep. 30, 2018
Receivables [Abstract]  
Accounts Receivable

4.

Accounts Receivable

Accounts receivable of $317,056 and $330,173, is net of an allowance for doubtful accounts of $5,629 and $8,350 and includes amounts of retention on incomplete projects to be completed within one year of $40,215 and $39,678 at September 30, 2018 and September 30, 2017, respectively.