Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Financial Instruments and Balance Sheet Classification (Parenthetical) (Detail)

v3.22.2.2
Financial Instruments - Financial Instruments and Balance Sheet Classification (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Apr. 30, 2022
Investments Debt And Equity Securities [Abstract]      
Obligations for which assets are held in trust $ 178.8   $ 160.8
Gain on marketable securities 0.1 $ 5.2  
Unvested obligations under deferred compensation plans $ 17.5   $ 24.0