Annual report pursuant to Section 13 and 15(d)

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

v3.22.2
Financial Instruments - Financial Instruments and Balance Sheet Classification (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Investments Debt And Equity Securities [Abstract]      
Obligations for which assets are held in trust $ 160.8 $ 157.3  
Income (loss) on marketable securities (12.0) 38.5 $ (1.8)
Unvested obligations under deferred compensation plans $ 24.0 $ 26.5