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Stock Option Plans (Tables)
 12 Months Ended
Jul. 31, 2012
Stock Option Plans [Abstract]  
Weighted Average Assumptions For Recognized Fair Value Of Stock-Based Employee Compensation Cost
                     
    2012   2011   2010  
Risk - free interest rate     <0.11 - 1.8 %   <0.12 - 3.1 %   < 0.01 - 3.9 %
Expected volatility     25.8 - 31.9 %   25.5 - 34.7 %   24.4 - 32.3 %
Expected dividend yield     1.0 %   1.0 %   1.0 %
                     
Expected life                    
Director original grants without reloads     8 years     8 years     8 years  
Non - officer original grants     7 years     8 years     7 - 8 years  
Officer original grants with reloads     —     —     4 years  
Reload grants     <8 years     <8 years     <8 years  
Officer original grants without reloads     8 years     8 years     8 years  
Stock Option Activity
      Options
Outstanding 		    Weighted
Average Exercise
Price 		 
  Outstanding at July 31, 2009       9,996,250     $ 13.47  
  Granted       1,287,948       21.21  
  Exercised       (1,697,980 )     10.42  
  Canceled       (42,594 )     20.97  
  Outstanding at July 31, 2010       9,543,624       15.02  
  Granted       1,103,202       28.61  
  Exercised       (2,243,502 )     11.55  
  Canceled       (15,330 )     23.60  
  Outstanding at July 31, 2011       8,387,994       17.72  
  Granted       1,082,979       34.76  
  Exercised       (1,379,827 )     11.90  
  Canceled       (34,819 )     27.45  
  Outstanding at July 31, 2012       8,056,327       20.97  
Outstanding And Exercisable Options
                                 
Range of Exercise Prices   Number
Outstanding 		  Weighted
Average
Remaining
Contractual
Life (Years) 		  Weighted
Average
Exercise
Price 		  Number
Exercisable 		  Weighted
Average
Exercise
Price 		 
$8.89 to $12.89     559,800     0.75   $ 9.99     559,800   $ 9.99  
$12.90 to $16.89     2,430,944     2.34     15.53     2,430,944     15.53  
$16.90 to $20.89     1,476,801     5.32     17.84     1,465,291     17.85  
$20.90 to $24.89     1,541,740     6.67     21.78     1,371,437     21.86  
$24.90 and above     2,047,042     8.61     32.08     423,458     30.07  
      8,056,327     5.20     20.97     6,250,930     17.95  
Status for Options Contain Vesting Provisions
               
    Options   Weighted
Average Grant
Date Fair
Value 		 
Non - vested at July 31, 2011     1,385,750   $ 8.45  
Granted     1,004,500     9.63  
Vested     (550,868 )   8.06  
Canceled     (33,985 )   8.42  
Non - vested at July 31, 2012     1,805,397     9.22