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Component of Property and Equipment and their Estimated Useful Lives (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Sep. 30, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment $ 179,516 $ 179,631
Less: accumulated depreciation 111,177 111,508
Property and equipment, net $ 68,339 $ 68,123