Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Apr. 30, 2024 USD ($) Customer shares	Apr. 30, 2023 USD ($) Customer shares	Apr. 30, 2022 USD ($) shares	Feb. 01, 2024 USD ($)	Apr. 30, 2020 USD ($)
Product Information [Line Items]
Maximum maturity period of all highly liquid investments to be considered cash equivalents	3 months
Goodwill	$ 19,024,000	$ 19,024,000		$ 19,000,000
Remaining estimated cost related to recalls, safety alerts, and consumer advisories	38,000
Warranty expense	2,600,000	1,500,000	$ 1,900,000
Promotional programs amount	600,000	10,200,000	6,600,000
Selling and marketing expenses	$ 2,600,000	$ 2,700,000	$ 4,300,000
Shares excluded from the computation of diluted earnings per share | shares	18,009	30,307	43,530
Self Insurance
Product Information [Line Items]
Maximum amount of self-insurance per occurrence					$ 10,000,000
ASU 2014-09
Product Information [Line Items]
Description of payment terms	We generally sell our products free on board, or FOB, shipping point and provide payment terms to most commercial customers ranging from 20 to 60 days of product shipment with a discount available to some customers for early payment. Generally, framework contracts define the general terms of sales, including payment terms, freight terms, insurance requirements, and cancelation provisions. Purchase orders define the terms for specific sales, including description, quantity, and price of each product purchased. We estimate variable consideration relative to the amount of cash discounts to which customers are likely to be entitled. As a result of utilizing practical expedients upon the adoption of ASC 606, we do not consider these extended terms to be a significant financing component of the contract because the payment terms are less than one year.
Other Capitalized Property Plant and Equipment | Maximum
Product Information [Line Items]
Estimated useful life	10 years
Sales, net | Customer Concentration Risk
Product Information [Line Items]
Number of Customers Accounted for Net Sales. | Customer	3	2
Sales, net | Customer Concentration Risk | Customer Two
Product Information [Line Items]
Concentration of risk, percentage		22.80%
Sales, net | Customer Concentration Risk | Customer Two | Minimum
Product Information [Line Items]
Concentration of risk, percentage		10.00%
Sales, net | Customer Concentration Risk | Customer Three
Product Information [Line Items]
Concentration of risk, percentage	34.80%
Sales, net | Customer Concentration Risk | Customer Three | Minimum
Product Information [Line Items]
Concentration of risk, percentage	10.00%
Accounts Receivable | Customer Concentration Risk
Product Information [Line Items]
Number of Customers Accounted for Accounts Receivable | Customer	2	3
Accounts Receivable | Customer Concentration Risk | Customer Two
Product Information [Line Items]
Concentration of risk, percentage	47.90%
Accounts Receivable | Customer Concentration Risk | Customer Two | Minimum
Product Information [Line Items]
Concentration of risk, percentage	10.00%
Accounts Receivable | Customer Concentration Risk | Customer Three
Product Information [Line Items]
Concentration of risk, percentage		39.40%
Accounts Receivable | Customer Concentration Risk | Customer Three | Minimum
Product Information [Line Items]
Concentration of risk, percentage		10.00%
Level 2
Product Information [Line Items]
Fair value of financial instrument	$ 0	$ 0