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Stockholders' Equity (Narrative) (Details) (USD $)
 12 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Shares purchased, shares   3,980,000  
Shares purchased, price per share   $ 29.00  
Shares purchased, value   $ 115,420,000  
Percentage of common stock outstanding at time of repurchase   7.20%  
Option expiration from the date of grant, in years 10    
Option vesting period, minimum years 3    
Option vesting period, maximum years 5    
Weighted average remaining contractual life of outstanding options, years 7.53    
Weighted average remaining contractual life of exercisable options, years 5.62    
Weighted average fair value of options granted $ 10.80 $ 14.69 $ 0.00
Cash received from stock option exercises 1,047,000 16,000 27,000
Total intrinsic value of stock options exercised 1,551,000 3,000 0
Tax benefits from stock compensation expense 1,172,000 481,000 226,000
Number of shares allowed for granting under restricted stock plan 600,000    
Stock awards restriction expiration of 50 %, years after date of issue 5    
Stock awards restriction expiration of remaining balance, years after date of issue 6    
Restricted stock expiration, percentage 50.00%    
Total fair value of restricted stock vested during the year 0 113,000 480,000
2010 Equity Incentive Plan [Member]
      
Number of shares authorized under stock option plan 2,000,000    
2006 Equity Incentive Plan [Member]
      
Number of shares authorized under stock option plan 1,100,000    
Stock Option Awards [Member]
      
Total compensation expenses 2,707,000 1,375,000 589,000
Unrecognized compensation costs 2,431,000    
Weighted average recognition period for compensation expenses, years 4.06    
Restricted Stock Awards [Member]
      
Total compensation expenses 0 12,000 68,000
Unrecognized compensation costs $ 0