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Stock-based Payment Compensation (Tables)
3 Months Ended
Oct. 31, 2014
Stock-based Compensation [Abstract]  
Summary of option activity for stock options
(In thousands, except per share and term data) Shares Weighted Average
Exercise Price
 Weighted Average
Remaining Contractual
Term (In years)
 Aggregate
Intrinsic Value
Outstanding as of July 31, 2014  19,082  $21.64   6.01  $235,734 
Grants of options  85   31.49         
Exercises  (309)  19.04         
Forfeitures or expirations              
Outstanding as of October 31, 2014  18,858  $21.73   5.88  $232,305 
Exercisable as of October 31, 2014  13,032  $16.33   4.55  $223,012 
Recognized stock-based compensation expense
  Three Months Ended October 31,
(In thousands) 2014 2013
General and administrative $3,820 $4,232
Yard Operations  546  635
Total stock-based compensation $4,366 $4,867