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Stock-Based Compensation (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Restricted Stock [Member]
Apr. 30, 2013
Restricted Stock [Member]
Apr. 30, 2011
2005 Stock Incentive Plan [Member]
Apr. 30, 2013
2005 Stock Incentive Plan [Member]
Jan. 28, 2013
2011 Management Incentive Plan [Member]
Directors
Apr. 30, 2013
2011 Management Incentive Plan [Member]
Apr. 30, 2011
2011 Management Incentive Plan [Member]
Jan. 28, 2013
2011 Management Incentive Plan [Member]
Employee Stock [Member]
Jan. 28, 2013
2011 Management Incentive Plan [Member]
Restricted Stock [Member]
Apr. 30, 2013
Maximum [Member]
2011 Management Incentive Plan [Member]
Board Of Director Members For October Two Thousand Eleven Option Grants [Member]
Apr. 30, 2013
Maximum [Member]
2011 Management Incentive Plan [Member]
Stock Options [Member]
Board Of Director Members For October Two Thousand Eleven Option Grants [Member]
Apr. 30, 2013
Minimum [Member]
2011 Management Incentive Plan [Member]
Board Of Director Members For April Two Thousand Eleven Option Grants [Member]
Apr. 30, 2013
Minimum [Member]
2011 Management Incentive Plan [Member]
Stock Options [Member]
Board Of Director Members For April Two Thousand Eleven Option Grants [Member]
Stock-Based Compensation (Textual) [Abstract]                              
Common stock shares authorized under ESPP                 1,500,000            
Common stock shares purchased under ESPP         0                    
Stock options vesting period                         5 years   1 year
Restricted stock closing price awarded to non employee director             $ 24.71                
Term of vested stock options                       5 years   2 years  
Weighted average remaining life of stock options           4 years 10 months 24 days   7 years 1 month 6 days              
Exercisable stock options, weighted-average remaining contractual term           3 years 9 months 18 days   4 years 6 months 0 days              
Number of non-employee directors             12                
Total restricted shares issued to Non-employee Directors                     12,000        
Stock-based compensation expense $ 191 $ 210 $ 100 $ 200                      
Restricted shares issued per Non employee director                   1,000