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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 196,645 $ 182,356
Accumulated depreciation and amortization (69,485) (61,003)
Property and equipment, net 127,160 121,353
Land [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 51,283 50,568
Buildings and Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 100,284 93,175
Machinery and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 33,278 27,634
Furniture and Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,938 3,678
Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 7,862 $ 7,301