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Stockholder's Equity (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based payment compensation $ 40,922 $ 23,322 $ 23,445
General and administrative      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based payment compensation 35,633 17,567 18,254
Yard operations      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based payment compensation $ 5,289 $ 5,755 $ 5,191