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Component of Property and Equipment and their Estimated Useful Lives (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment $ 172,685us-gaap_PropertyPlantAndEquipmentGross $ 170,307us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 106,984us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 102,888us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net $ 65,701us-gaap_PropertyPlantAndEquipmentNet $ 67,419us-gaap_PropertyPlantAndEquipmentNet