Annual report pursuant to Section 13 and 15(d)

Business Acquisition - Assets Acquired and Liabilities Assumed (Detail)

v3.10.0.1
Business Acquisition - Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 15, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]        
Goodwill   $ 32,919 $ 30,600 $ 29,957
Acquired construction backlog        
Business Acquisition [Line Items]        
Useful Life   17 months    
Customer relationship        
Business Acquisition [Line Items]        
Useful Life   8 years    
Scruggs Company        
Business Acquisition [Line Items]        
Cash payment to acquire business $ 4,700      
Contracts receivable including retainage 9,184      
Costs and estimated earnings in excess of billings on uncompleted contracts 1,787      
Inventory 4,323      
Other current assets 731      
Goodwill 2,319      
Accounts payable (3,646)      
Billings in excess of costs and estimated earnings on uncompleted contracts (4,589)      
Current maturities of long-term debt (358)      
Other current liabilities (1,770)      
Payable to seller (4,940)      
Long-term debt, net of current maturities (744)      
Fair value of assets acquired and liabilities assumed 51,319      
Revenues   $ 35,800    
Net income   3,500    
General and administrative expenses   $ 200    
Scruggs Company | Acquired construction backlog        
Business Acquisition [Line Items]        
Finite-lived intangible assets $ 594      
Useful Life 17 months      
Scruggs Company | Customer relationship        
Business Acquisition [Line Items]        
Finite-lived intangible assets $ 1,100      
Useful Life 8 years      
Scruggs Company | Equipment        
Business Acquisition [Line Items]        
Property, plant, and equipment $ 17,571      
Scruggs Company | Quarry reserves        
Business Acquisition [Line Items]        
Property, plant, and equipment 13,986      
Scruggs Company | Land and land improvements        
Business Acquisition [Line Items]        
Property, plant, and equipment 7,302      
Scruggs Company | Plant        
Business Acquisition [Line Items]        
Property, plant, and equipment 6,917      
Scruggs Company | Buildings        
Business Acquisition [Line Items]        
Property, plant, and equipment $ 1,552