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Stock-based Compensation (Tables)
3 Months Ended
Oct. 31, 2013
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
Summary of option activity for stock options

 
Shares (in 000s)
   
Weighted
average
Exercise Price
   
Weighted average
Remaining
Contractual Term
   
Aggregate
Intrinsic Value (in 000s)
 
                         
Outstanding at July 31, 2013
    14,922     $ 16.75       5.91     $ 235,086  
Grants of options
    -       -                  
Exercises
    (20 )   $ 15.37                  
Forfeitures or expirations
    -       -                  
                                 
Outstanding at October 31, 2013
    14,902     $ 16.76       5.64     $ 230,571  
                                 
Exercisable at October 31, 2013
    12,169     $ 16.08       5.36     $ 196,496  
 
Recognized stock-based compensation expense
 
  
Three Months Ended October 31,
 
  
2013
  
2012
 
General and administrative
 $4,232  $4,570 
Yard operations
  635   604 
  $4,867  $5,174