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Deferred Compensation And Retirement Plans - Reconciliation Of Benefit Obligation (Parenthetical) (Detail) - CSV of COLI Contracts - USD ($)
$ in Millions
Apr. 30, 2021
Apr. 30, 2020
Defined Benefit Plan Disclosure [Line Items]    
Outstanding policy loans $ 80.0 $ 92.3
Deferred Compensation Plan    
Defined Benefit Plan Disclosure [Line Items]    
Gross CSV 241.3 238.7
Outstanding policy loans $ 80.0 $ 92.3