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Stock-Based Benefit Plans (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Weighted-average assumptions and the fair value used for stock option grants            
Weighted-average volatility         46.99% 47.73%
Weighted-average grant date fair value per share of options granted         $ 8.70 $ 7.94
Stock-based compensation expense recognized and estimated amount to be recognized            
Stock based expense recognized $ 3,367,000 $ 2,430,000 $ 12,227,000 $ 10,147,000    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments         0 0
Employee Stock Option [Member]
           
Stock-based compensation expense recognized and estimated amount to be recognized            
Stock based expense recognized $ 1,346,000 $ 1,402,000 $ 6,091,000 $ 7,307,000    
Maximum [Member]
           
Weighted-average assumptions and the fair value used for stock option grants            
Expected volatility         50.24% 49.46%
Risk-free interest rate         1.77% 3.09%
Expected life (years)         9 years 0 months 22 days 8 years 9 months
Minimum [Member]
           
Weighted-average assumptions and the fair value used for stock option grants            
Expected volatility         44.20% 45.38%
Risk-free interest rate         0.78% 1.64%
Expected life (years)         4 years 7 months 2 days 4 years 3 months 14 days