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Stock-based Payment Compensation (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 5,941 $ 5,008 $ 17,239 $ 15,613
General and administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 4,883 4,180 14,327 13,176
Yard Operations        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 1,058 $ 828 $ 2,912 $ 2,437