Defined Contribution Plans - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Apr. 30, 2022 |
Apr. 30, 2021 |
Apr. 30, 2020 |
|
U.S. Employees 401(K) Plan [Member] | Maximum [Member] | |||
Defined Contribution Plan Disclosure [Line Items] | |||
Percentage of employee contributions matched to the plan | 4.00% | ||
U.K. Employees Personal Pension Plan and U.S. Employees 401(K) Plan [Member] | |||
Defined Contribution Plan Disclosure [Line Items] | |||
Total employer contributions | $ 0.6 | $ 0.4 | $ 0.3 |