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Stock-Based Compensation - Schedule of Non-Vested Restricted Stock Units Activity (Parenthetical) (Detail) - shares
Mar. 31, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares issued 5,066,467 5,046,628
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares issued 19,325