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Stock-Based Compensation - Aggregate Intrinsic Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate intrinsic value, Stock option $ 584 $ 7,448
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate intrinsic value, Restricted stock $ 1,470 $ 3,047