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Concentration of Risk (Detail) - Customer concentration risk - Freedom Roads, LLC
3 Months Ended 9 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Sales revenue        
Concentration Risk [Line Items]        
Concentration risk percentage 13.00% 15.00% 13.00% 15.00%
Accounts receivable        
Concentration Risk [Line Items]        
Concentration risk percentage     15.00% 18.00%