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Deferred Compensation and Retirement Plans - Components of Net Periodic Benefits Costs (Detail) - Deferred Compensation Plan - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 6,502 $ 4,538 $ 18,432 $ 12,716
Interest cost 1,423 1,330 4,238 3,956
Amortization of actuarial loss 746 446 2,236 1,338
Expected return on plan assets [1] (363) (392) (1,089) (1,176)
Net periodic service credit amortization (77) (77) (231) (231)
Net periodic benefit costs [2] $ 8,231 $ 5,845 $ 23,586 $ 16,603
[1] The expected long-term rate of return on plan assets was 6.00% and 6.25% for January 31, 2020 and 2019, respectively.
[2] 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.