Annual report pursuant to Section 13 and 15(d)

Business Acquisitions - Proforma Revenue and Net Income (Detail)

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Business Acquisitions - Proforma Revenue and Net Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2019
May 15, 2018
Business Acquisition [Line Items]      
Long-term debt $ 63,264 $ 50,263  
Scruggs Company      
Business Acquisition [Line Items]      
Long-term debt     $ 1,100
Pro forma revenues 735,197    
Pro forma net income $ 55,558    
Senior Notes | Scruggs Company      
Business Acquisition [Line Items]      
Long-term debt     $ 22,000