Annual report pursuant to Section 13 and 15(d)

Deferred Compensation And Retirement Plans - Reconciliation Of Benefit Obligation (Parenthetical) (Detail)

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Deferred Compensation And Retirement Plans - Reconciliation Of Benefit Obligation (Parenthetical) (Detail) - CSV of COLI Contracts - USD ($)
$ in Millions
Apr. 30, 2019
Apr. 30, 2018
Defined Benefit Plan Disclosure [Line Items]    
Outstanding policy loans $ 93.2 $ 66.7
Deferred Compensation Plan    
Defined Benefit Plan Disclosure [Line Items]    
Gross CSV 219.2 186.8
Outstanding policy loans $ 93.2 $ 66.7