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Component of Property and Equipment and their Estimated Useful Lives (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Sep. 30, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment $ 177,879 $ 179,631
Less: accumulated depreciation 109,024 111,508
Property and equipment, net $ 68,855 $ 68,123