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Employee Stock Plans - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 03, 2019 | Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payments of tax withholdings on restricted stock |  | $ 18,532,000 | $ 4,989,000 | $ 8,993,000 |
Shares repurchased during the period, value |  | $ 117,301,000 | $ 35,376,000 | $ 101,439,000 |
Treasury Stock, Common |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares repurchased during the period |  | 1,470,983 | 973,451 | 2,606,861 |
Shares repurchased during the period, value |  | $ 98,800,000 | $ 30,400,000 | $ 92,400,000 |
ESPP |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for future issuance |  | 400,000 |  |  |
Maximum number of shares reserved for issuance |  | 3,000,000.0 |  |  |
Authorized payroll deductions |  | 15.00% |  |  |
Authorized payroll deductions, value |  | $ 25,000 |  |  |
Employees stock purchased |  | 103,826 | 188,608 | 220,161 |
Employees stock purchased, average price per share |  | $ 66.64 | $ 30.25 | $ 34.90 |
ESPP | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair market price of common stock |  | 85.00% |  |  |
ESPP | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair market price of common stock |  | 100.00% |  |  |
Time Based Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 4 years |  |  |
Market Based Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Shares outstanding |  | 400,000 |  |  |
Total unrecognized compensation cost related to non-vested awards |  | $ 9,300,000 |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares outstanding |  | 1,980,000 | 2,370,000 | 1,365,000 | 1,460,000
Total unrecognized compensation cost related to non-vested awards |  | $ 51,900,000 |  |  |
Expected cost recognized over weighted-average period |  | 2 years 4 months 24 days |  |  |
Shares repurchased during the period to pay for taxes |  | 271,794 | 172,749 |  |
Payments of tax withholdings on restricted stock |  | $ 18,500,000 | $ 5,000,000.0 |  |
Stock Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock available for stock-based awards | 2,141,807 |  |  |  |
Shares available for future issuance | 3,600,000 |  |  |  |
Vesting period | 1 year |  |  |  |

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