Significant Accounting Policies (Tables)

9 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of revenue by major customers

The following table reflects, for the periods presented, (i) revenues generated from public infrastructure construction projects and the sale of construction materials to public customers and (ii) revenues generated from private infrastructure construction projects and the sale of construction materials to private customers.

	For the Three Months Ended June 30,				For the Nine Months Ended June 30,
	2019		2018		2019		2018
Private	$	66,207	$	56,293	$	166,193	$	148,525
Public	$	161,083	$	138,782	$	379,728	$	315,870

Schedule of customer concentration risk

Customers that accounted for more than 10% of consolidated revenues during those periods are presented below:

	% of Consolidated Revenues
	For the Three Months Ended June 30,				For the Nine Months Ended June 30,
	2019		2018		2019		2018
Alabama Department of Transportation	15.4	%	17.0	%	12.9	%	14.8	%
North Carolina Department of Transportation	13.9	%	14.8	%	13.4	%	13.5	%