Concentration of Risk (Detail) - Customer concentration risk - Freedom Roads, LLC	3 Months Ended
Oct. 31, 2020	Oct. 31, 2019
Sales revenue
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	15.00%
Accounts receivable
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	18.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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