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Stock-Based Benefit Plans (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Weighted-average assumptions and the fair value used for stock option grants        
Number of options issued (in thousands)          
Stock-based compensation expense recognized and estimated amount to be recognized        
Stock-compensation expense recognized $ 5,626 $ 5,373    
Stock Option [Member]
       
Weighted-average assumptions and the fair value used for stock option grants        
Expected volatility     44.20% 45.38%
Weighted-average volatility     46.99% 47.73%
Risk-free interest rate       1.64%
Dividends          
Weighted-average grant date fair value per share of options granted     8.7 7.94
Stock-based compensation expense recognized and estimated amount to be recognized        
Stock-compensation expense recognized $ 3,522 $ 4,588    
Maximum [Member]
       
Weighted-average assumptions and the fair value used for stock option grants        
Risk-free interest rate     1.77%  
Expected life (years)     9.06 8.75
Maximum [Member] | Stock Option [Member]
       
Weighted-average assumptions and the fair value used for stock option grants        
Expected volatility     50.24% 49.46%
Maximum [Member] | Employee Stock Option [Member] | Stock Option [Member]
       
Weighted-average assumptions and the fair value used for stock option grants        
Risk-free interest rate       3.09%
Minimum [Member]
       
Weighted-average assumptions and the fair value used for stock option grants        
Risk-free interest rate     0.78%  
Expected life (years)     4.59 4.29