Annual report pursuant to Section 13 and 15(d)

Business Acquisition - Proforma Revenue and Net Income (Detail)

v3.10.0.1
Business Acquisition - Proforma Revenue and Net Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
May 15, 2018
Business Acquisition [Line Items]      
Long-term debt $ 63,264 $ 57,500  
Scruggs Company      
Business Acquisition [Line Items]      
Long-term debt     $ 1,100
Pro forma revenues 735,197 661,979  
Pro forma net income 55,558 34,671  
General and administrative expenses 200    
Senior Notes      
Business Acquisition [Line Items]      
Long-term debt $ 57,300 $ 47,500  
Senior Notes | Scruggs Company      
Business Acquisition [Line Items]      
Long-term debt     $ 22,000