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Property and Equipment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Property and equipment $ 112,515 $ 164,548
Less: accumulated depreciation and amortization (73,809) (127,871)
Total $ 38,706 $ 36,677