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Stock-based Payment Compensation (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation $ 5,306 $ 5,085
General and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation 4,454 4,284
Yard Operations    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation $ 852 $ 801