Annual report pursuant to Section 13 and 15(d)

Business Acquisition - Additional Information (Detail)

v3.10.0.1
Business Acquisition - Additional Information (Detail)
$ in Thousands
12 Months Ended
May 15, 2018
USD ($)
plant
mine
Sep. 22, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Business Acquisition [Line Items]        
Long-term debt     $ 63,264 $ 57,500
Senior Notes        
Business Acquisition [Line Items]        
Long-term debt     57,300 $ 47,500
Scruggs Company        
Business Acquisition [Line Items]        
Acuisition of common shares and voting interest 100.00%      
Long-term debt $ 1,100      
Purchase price 51,300      
Cash payment to acquire business 4,700      
Revenues     35,800  
Net income     3,500  
General and administrative expenses     $ 200  
Scruggs Company | Senior Notes        
Business Acquisition [Line Items]        
Long-term debt $ 22,000      
Sand and gravel mining operations        
Business Acquisition [Line Items]        
Cash payment to acquire business   $ 10,843    
Purchase commitment with seller   $ 3,100    
Term of purchase commitment with seller     2 years  
Inventory purchased     $ 2,300  
Scruggs Company        
Business Acquisition [Line Items]        
Hot mix asphalt plants (in plants) | plant 3      
Aggregate mines (in mines) | mine 3      
Industrial plants (in plants) | plant 1