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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 210,729 $ 196,645
Accumulated depreciation and amortization (72,013) (69,485)
Property and equipment, net 138,716 127,160
Land [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 56,628 51,283
Buildings and Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 108,693 100,284
Machinery and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 32,155 33,278
Furniture and Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,925 3,938
Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 9,328 $ 7,862