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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, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 8,218 $ 6,502 $ 23,698 $ 18,432
Interest cost 1,047 1,423 3,127 4,238
Amortization of actuarial loss 997 746 2,990 2,236
Expected return on plan assets [1] (351) (363) (1,053) (1,089)
Net periodic service credit amortization (101) (77) (304) (231)
Net periodic benefit costs [2] $ 9,810 $ 8,231 $ 28,458 $ 23,586
[1] The expected long-term rate of return on plan assets was 6.00% and 6.00% for January 31, 2021 and 2020, 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.