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EQUITY INCENTIVE PLAN - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 15, 2012
Dec. 14, 2011
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Oct. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expiration period of options granted         10 years    
Total number of shares of common stock that may be issued as awards under 2008 Plan     750,000   750,000    
Options granted   45,236     45,236    
Expected volatility   64.00%          
Expected term of options   5 years          
Dividend yield rate   0.00%          
Risk-free interest rate   0.86%          
Grant date fair value of stock options   $ 11.50          
Restricted stock granted 6,475 24,243     30,718    
Grant date fair value of restricted stock $ 27.00 $ 21.45 $ 22.84   $ 22.84   $ 24.38
Stock-based compensation expense     $ 224,000 $ 138,000 $ 646,000 $ 332,000  
Unrecognized Stock-based compensation expense     $ 1,300,000   $ 1,300,000    
Stock Options
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   3 years          
Restricted Stock
             
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period 1 year 3 years