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Concentration of Risk - Additional Information (Detail) - Customer Concentration Risk - Freedom Roads, LLC	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Net Sales
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	16.00%	19.00%	20.00%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage			15.00%		26.00%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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.

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