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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Jul. 31, 2015
Jul. 31, 2014
Property, Plant and Equipment [Line Items]    
Property and equipment $ 1,115,755 $ 1,077,617
Less: accumulated depreciation and amortization (415,353) (385,234)
Property and equipment, net 700,402 692,383
Transportation and other equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 70,133 68,956
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment 44,837 41,504
Software    
Property, Plant and Equipment [Line Items]    
Property and equipment 65,072 61,698
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment 481,748 475,564
Buildings and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 453,965 $ 429,895