Annual report pursuant to Section 13 and 15(d)

Deferred Compensation And Retirement Plans (Components Of Net Periodic Benefit Costs) (Detail)

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Deferred Compensation And Retirement Plans (Components Of Net Periodic Benefit Costs) (Detail) - Medical and Life Insurance - Hay Group - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 155 $ 62
Interest cost 426 208
Net periodic benefit cost $ 581 $ 270