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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, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 6,474 $ 4,532 $ 11,930 $ 8,178
Interest cost 1,422 1,330 2,815 2,626
Amortization of actuarial loss 745 446 1,490 892
Expected return on plan assets [1] (363) (392) (726) (784)
Net periodic service credit amortization (77) (77) (154) (154)
Net periodic benefit costs [2] $ 8,201 $ 5,839 $ 15,355 $ 10,758
[1] The expected long-term rate of return on plan assets was 6.00% and 6.25% for October 31, 2019 and 2018, 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 (loss), net, respectively, on the consolidated statements of income.