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Stockholder's Equity (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based payment compensation $ 20,864 $ 18,154 $ 22,099
General and administrative      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based payment compensation 18,194 15,938 19,489
Yard operations      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based payment compensation $ 2,670 $ 2,216 $ 2,610