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Stock-Based Compensation - Aggregate Intrinsic Value (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate intrinsic value, Stock option $ 7,448,000 $ 2,194,000
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate intrinsic value, Restricted stock $ 3,046,772 $ 1,143,000