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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 182,356 $ 155,269
Accumulated depreciation and amortization (61,003) (56,282)
Property and equipment, net 121,353 98,987
Land [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 50,568 43,090
Buildings and Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 93,175 78,425
Machinery and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 27,634 24,709
Furniture and Fixtures [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,678 3,199
Vehicles [Member]    
Property Plant And Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 7,301 $ 5,846