Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions - Additional Information (Detail)

v3.19.1
Business Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 26, 2019
Mar. 31, 2019
Mar. 31, 2019
Sep. 30, 2018
May 15, 2018
Business Acquisition [Line Items]          
Goodwill   $ 36,968 $ 36,968 $ 32,919  
Hot Mix Asphalt and Ready-Mix Concrete          
Business Acquisition [Line Items]          
Purchase price $ 8,900        
Goodwill $ 4,000        
Acquisition costs incurred   100 100    
Scruggs Company          
Business Acquisition [Line Items]          
Acquisition of common shares and voting interest         100.00%
Revenues   18,400 34,700    
Net income   $ 1,400 $ 2,900