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Stock-Based Compensation - Additional Information (Detail) - USD ($)
6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Tax benefits of options exercised $ 0 $ 0
Net proceeds from issuance of common stock under incentive compensation and employee purchase plans 610,000 3,020,000
Selling, General, and Administrative Expenses [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Stock-based compensation expense, approximately $ 2,200,000 $ 1,600,000