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Property and Equipment, Net (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,049,623 $ 910,593
Less accumulated depreciation and amortization (372,106) (323,430)
Property, plant and equipment, net, total 677,517 587,163
Transportation and other equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 58,016 52,066
Office furniture and equipment
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 59,936 53,363
Software
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 74,261 54,399
Land
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 443,126 350,463
Buildings and leasehold improvements
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 414,284 $ 400,302