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Advertising Costs - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Selling and Marketing Expense |  |  |
Advertising Costs [Line Items] |  |  |
Advertising expense for continuing operations | $ 12.5 | $ 13.6 | $ 13.4

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- Definition Advertising costs. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Period Type: | duration

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- Details
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Period Type: |