Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Additional Information (Detail)

v3.22.2.2
Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Apr. 30, 2022
Financial Instrument [Line Items]      
Sale/maturities of available-for-sale marketable securities $ 14.4 $ 21.7  
Unrealized losses relates to equity securities 0.5    
Unrealized gains relates to equity securities   4.1  
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts      
Financial Instrument [Line Items]      
Foreign currency gains (losses) (0.6) $ 0.1  
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts | Income Taxes And Other Receivables | Derivatives Purchased      
Financial Instrument [Line Items]      
Derivative notional amount 97.9   $ 89.7
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts | Income Taxes And Other Receivables | Derivatives Sold      
Financial Instrument [Line Items]      
Derivative notional amount $ 40.5   $ 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 21 months