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Summary of Outstanding and Non-Vested Stock Option and Restricted Stock Activity (Detail) (USD $)
6 Months Ended
Mar. 31, 2013
Stock Options
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance, Shares 612,071
Granted, Shares 47,470
Exercised, Shares (114,730)
Expired / Cancelled, Shares (14,416)
Ending Balance, Shares 530,395
Beginning Balance, Weighted Average Exercise price $ 8.47
Granted, Weighted Average Fair Value $ 11.93
Exercised, Weighted Average Fair Value $ 8.67
Expired / Cancelled, Restricted Stock Weighted Average Exercise Price $ 8.48
End of period, Weighted Average Exercise Price $ 8.74
Non Vested Stock Options
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance, Shares 138,835
Granted, Shares 47,470
Vested, Shares (77,184)
Expired / Cancelled, Shares (1,416)
Ending Balance, Shares 107,705
Beginning Balance, Weighted Average Exercise price $ 3.55
Granted, Weighted Average Fair Value $ 5.41
Vested, Weighted Average Fair Value $ 3.61
Expired / Cancelled, Restricted Stock Weighted Average Exercise Price $ 4.50
End of period, Weighted Average Exercise Price $ 4.31
Restricted Stock
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance, Outstanding and Non-Vested shares 64,497
Granted, Outstanding and Non vested shares 36,060
Vested Outstanding and Non vested, shares (29,505)
Exercised, Outstanding and Non vested, shares   
Expired / Cancelled, Outstanding and Non vested, shares   
Ending Balance, Outstanding and Non-Vested Shares 71,052
Beginning Balance, Outstanding and Non Vested, Weighted average fair value per share $ 7.52
Granted, Restricted Stock Weighted Average Exercise Price $ 11.93
Vested Outstanding and Non-Vested Weighted Average Fair Value $ 7.42
Exercised, Restricted Stock Weighted Average Exercise Price   
Expired / Cancelled, Restricted Stock Weighted Average Exercise Price   
Ending Balance, Outstanding and Non-Vested, Weighted Average Fair Value Per Share $ 9.80