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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 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 9,749 $ 8,197 $ 18,428 $ 15,480
Interest cost 1,038 1,047 2,057 2,080
Amortization of actuarial loss 542 996 1,085 1,993
Expected return on plan assets [1] (386) (351) (773) (702)
Net periodic service credit amortization (102) (102) (203) (203)
Net periodic benefit costs [2] $ 10,841 $ 9,787 $ 20,594 $ 18,648
[1] The expected long-term rate of return on plan assets was 6.00% and 6.00% for October 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 operations.