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Weighted Average Number of Certain Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Detail)
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average numbers of securities    46,273 246,142
Stock Options
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average numbers of securities      140,487
Restricted Stock
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Weighted average numbers of securities    46,273 105,655