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Stock-based Payment Compensation (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 5,992 $ 5,520 $ 11,298 $ 10,605
General and administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 4,990 4,712 9,444 8,996
Yard Operations        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 1,002 $ 808 $ 1,854 $ 1,609