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Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021	Apr. 30, 2022
Financial Instrument [Line Items]
Sale/maturities of available-for-sale marketable securities	$ 18.6	$ 14.3	$ 33.0	$ 36.0
Unrealized losses relates to equity securities			10.7
Unrealized gains relates to equity securities				8.1
Not Designated as Hedge Instrument | Foreign currency forward contracts
Financial Instrument [Line Items]
Foreign currency gains (losses)	(1.5)	$ 0.4	(2.1)	$ 0.5
Not Designated as Hedge Instrument | Foreign currency forward contracts | Income Taxes And Other Receivables | Derivatives Purchased
Financial Instrument [Line Items]
Derivative notional amount	107.4		107.4		$ 89.7
Not Designated as Hedge Instrument | Foreign currency forward contracts | Income Taxes And Other Receivables | Derivatives Sold
Financial Instrument [Line Items]
Derivative notional amount	$ 40.3		$ 40.3		$ 35.8
Available For Sale Marketable Securities | Minimum
Financial Instrument [Line Items]
Marketable securities remaining maturity			1 month
Available For Sale Marketable Securities | Maximum
Financial Instrument [Line Items]
Marketable securities remaining maturity			18 months

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Financial Instrument [Line Items]

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+ References

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-Publisher FASB
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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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