Annual report pursuant to Section 13 and 15(d)

Deferred Compensation And Retirement Plans - Components of Net Periodic Benefits Costs (Detail)

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Deferred Compensation And Retirement Plans - Components of Net Periodic Benefits Costs (Detail) - Deferred Compensation Plan - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 17,281 $ 11,373 $ 5,402
Interest cost 5,044 3,787 3,925
Amortization of actuarial loss (gain) 1,798 2,308 3,051
Expected return on plan assets (1,568) (1,594) (1,559)
Net periodic benefit cost [1] $ 22,555 $ 15,874 $ 10,819
[1] The service cost, interest cost and 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.