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Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Parenthetical) (Detail) - CSV of COLI Contracts - USD ($) $ in Millions	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Gross CSV	$ 180.3	$ 175.7
Outstanding policy loans	67.2	68.4
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Gross CSV	180.3	175.7	$ 172.3
Outstanding policy loans	$ 67.2	$ 68.4	$ 69.6

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Cash Surrender Value of Life Insurance Gross

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- Definition

Policy Loans Payable

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