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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Financial Instrument [Line Items] |  |  |
Sale/maturities of available-for-sale marketable securities | $ 38.1 | $ 58.6 | $ 79.3
Unrealized gains relates to equity securities | 25.1 |  |
Unrealized loss relates to equity securities |  | 3.8 | 27.3
Not Designated as Hedge Instrument | Foreign currency forward contracts |  |  |
Financial Instrument [Line Items] |  |  |
Foreign currency gains (losses) | 0.6 | 2.1 | $ (0.2)
Not Designated as Hedge Instrument | Foreign currency forward contracts | Derivatives Purchased |  |  |
Financial Instrument [Line Items] |  |  |
Derivative notional amount | 82.9 | 112.7 |
Not Designated as Hedge Instrument | Foreign currency forward contracts | Derivatives Sold |  |  |
Financial Instrument [Line Items] |  |  |
Derivative notional amount | $ 34.0 | $ 41.1 |
Minimum |  |  |
Financial Instrument [Line Items] |  |  |
Marketable securities remaining maturity | 1 month |  |
Maximum |  |  |
Financial Instrument [Line Items] |  |  |
Marketable securities remaining maturity | 23 months |  |

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CC + Details
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