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Stock-Based Compensation (Details 2) (USD $)
3 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Jul. 31, 2013
Stock-Based Compensation      
Total unrecognized stock-based compensation expense, before income taxes, related to total nonvested stock options and stock awards (in dollars) $ 11,580,000    
Remaining weighted average period over which unrecognized stock-based compensation expense is expected to be recognized 25 months    
Stock-based awards, additional disclosure      
Reissued shares from treasury stock for exercise of stock options and grant of stock awards (in shares)   127,525  
Deduction in income tax due to exercise of options and vesting of restricted stock (in dollars) 3,680,000 1,728,000  
Increase in additional paid-in capital due to excess tax benefit on stock-based compensation expense (in dollars) 2,596,000 913,000  
Restricted shares
     
Number of Shares      
Nonvested stock awards at the beginning of the period (in shares) 605,767    
Granted (in shares) 246,136    
Cancelled (in shares) (1,998)    
Vested (in shares) (286,215)    
Nonvested stock awards at the end of the period (in shares) 563,690    
Weighted Average Fair Value      
Nonvested stock awards at the beginning of the period (in dollars per share) $ 11.96    
Granted (in dollars per share) $ 31.82    
Cancelled (in dollars per share) $ 9.02    
Vested (in dollars per share) $ 10.31    
Nonvested stock awards at the end of the period (in dollars per share) $ 21.48    
Stock options
     
Weighted-Average Black-Scholes Option Valuation Assumptions      
Dividend yield (as a percent) 0.28% 0.37%  
Expected volatility (as a percent) 42.70% 50.90%  
Risk-free interest rate (as a percent) 1.44% 0.67%  
Expected lives 5 years 5 years  
Stock options, additional disclosure      
Weighted average fair value of all options granted (in dollars per share) $ 12.08 $ 7.27  
Aggregate intrinsic value of all options exercised (in dollars) $ 671,000 $ 264,000  
Number of Shares      
Outstanding at the beginning of the period (in shares) 403,831    
Options granted (in shares) 30,000 52,500  
Exercised (in shares) (27,002)    
Outstanding at the end of the period (in shares) 406,829    
Exercisable at the end of the period (in shares) 341,829   351,331
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 8.25    
Granted (in dollars per share) $ 31.81    
Exercised (in dollars per share) $ 6.01    
Outstanding at the end of the period (in dollars per share) $ 10.14    
Exercisable at the end of the period (in dollars per share) $ 7.53   $ 6.94