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 plan - Hay Group - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Defined Benefit Plan Disclosure [Line Items]      
Service cost   $ 91 $ 150
Interest cost $ 243 369 431
Net periodic service credit amortization (308) (308)  
Amortization of actuarial loss (gain) (14)    
Net periodic benefit cost [1] $ (79) $ 152 $ 581
[1] The service cost, interest cost and the other components of net periodic benefit costs are included in compensation and benefits expense, interest expense, net and other income, net, respectively, on the consolidated statements of income.