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Stock-Based Compensation (Details 2) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2012
Jul. 31, 2012
Jan. 31, 2013
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Stock-Based Compensation            
Additional stock-based compensation expense in connection with an employment termination requiring to accelerate vesting of certain stock options and restricted shares (in dollars) $ 309,000          
Total unrecognized stock-based compensation expense, before income taxes, related to total nonvested stock options and stock awards (in dollars)       4,727,000    
Remaining weighted average period over which unrecognized stock-based compensation expense is expected to be recognized       17 months    
Weighted-Average Black-Scholes Option Valuation Assumptions            
Dividend yield (as a percent)       0.30%    
Stock options, additional disclosure            
Aggregate intrinsic value of all options exercised (in dollars)       6,616,000 5,793,000 4,104,000
Aggregate fair value of all options vested (in dollars)       677,000 942,000 1,651,000
Weighted Average Exercise Price            
Aggregate intrinsic value of outstanding options (in dollars)   8,925,000   7,386,000 8,925,000  
Options vested or expected to vest            
Outstanding options (in shares)   814,235     814,235  
Aggregate intrinsic value (in dollars)   8,844,000     8,844,000  
Weighted average exercise price (in dollars per share)   $ 6.55     $ 6.55  
Reissued shares from treasury stock for exercise of stock options and grant of stock awards (in shares)   160,904 474,266      
Reduction in income tax payable due to exercise of options and vesting of restricted stock (in dollars)       3,892,000 3,329,000  
Increase in additional paid-in capital due to excess tax benefit on stock-based compensation expense (in dollars)       $ 2,875,000 $ 1,970,000  
Restricted shares
           
Number of Shares            
Nonvested stock awards at the beginning of the period (in shares)     708,008 708,008 545,838 356,967
Granted (in shares)       210,484 536,859 398,362
Cancelled (in shares)       (14,244) (83,002)  
Vested (in shares)       (298,481) (291,687) (209,491)
Nonvested stock awards at the end of the period (in shares)   708,008   605,767 708,008 545,838
Weighted Average Fair Value            
Nonvested stock awards at the beginning of the period (in dollars per share)     $ 9.15 $ 9.15 $ 8.01 $ 6.17
Granted (in dollars per share)       $ 17.55 $ 9.48 $ 8.47
Cancelled (in dollars per share)       $ 11.31 $ 8.63  
Vested (in dollars per share)       $ 9.26 $ 7.77 $ 5.74
Nonvested stock awards at the end of the period (in dollars per share)   $ 9.15   $ 11.96 $ 9.15 $ 8.01
Stock options
           
Weighted-Average Black-Scholes Option Valuation Assumptions            
Dividend yield (as a percent)       0.37%    
Expected volatility (as a percent)       0.509%    
Risk-free interest rate (as a percent)       0.67%    
Expected lives       5 years    
Stock options, additional disclosure            
Weighted average fair value of all options granted (in dollars per share)       $ 7.27    
Number of Shares            
Outstanding at the beginning of the period (in shares)     823,235 823,235 1,543,968 3,212,691
Options granted (in shares)       52,500    
Canceled (in shares)       (9,000) (24,748)  
Exercised (in shares)       (462,904) (695,985) (1,593,911)
Expired (in shares)           (74,812)
Outstanding at the end of the period (in shares)   823,235   403,831 823,235 1,543,968
Exercisable at the end of the period (in shares)   546,165   351,331 546,165 859,011
Weighted Average Exercise Price            
Outstanding at the beginning of the period (in dollars per share)     $ 6.57 $ 6.57 $ 6.47 $ 7.09
Granted (in dollars per share)       $ 17.04    
Canceled (in dollars per share)       $ 8.40 $ 6.98  
Exercised (in dollars per share)       $ 6.26 $ 6.32 $ 7.57
Expired (in dollars per share)           $ 9.46
Outstanding at the end of the period (in dollars per share)   $ 6.57   $ 8.25 $ 6.57 $ 6.47
Exercisable at the end of the period (in dollars per share)   $ 6.29   $ 6.94 $ 6.29 $ 5.99