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Stock-based Payment Compensation (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 5,034 $ 4,420 $ 15,834 $ 13,290
General and administrative [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 4,320 3,794 13,758 11,569
Yard Operations [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 714 $ 626 $ 2,076 $ 1,721