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Employee Stock Plans - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 03, 2019 | Oct. 31, 2020 | Jul. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Payments of tax withholdings on restricted stock |  |  |  |  |  | $ 4,550,000 | $ 8,725,000 |
Shares repurchased during the period, value |  | $ 22,878,000 | $ 4,442,000 | $ 49,325,000 | $ 21,329,000 |  |  |
Treasury Stock, Common |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares repurchased during the period |  | 753,451 |  | 1,309,092 |  | 753,451 | 1,633,192 |
Shares repurchased during the period, value |  | $ 22,800,000 |  | $ 49,200,000 |  | $ 22,800,000 | $ 61,900,000 |
ESPP |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares available for future issuance |  | 600,000 |  |  |  | 600,000 |  |
Authorized payroll deductions |  | 15.00% |  |  |  | 15.00% |  |
Authorized payroll deductions, value |  |  |  |  |  | $ 25,000 |  |
Maximum number of shares reserved for issuance |  | 3,000,000.0 |  |  |  | 3,000,000.0 |  |
Employees stock purchased |  | 0 |  | 0 |  | 129,047 | 126,604 |
Employees stock purchased, price per share |  |  |  |  |  | $ 26.12 | $ 34.06 |
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 |  | 300,000 |  |  |  | 300,000 |  |
Total unrecognized compensation cost related to non-vested awards |  | $ 6,800,000 |  |  |  | $ 6,800,000 |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares outstanding |  | 2,385,000 |  |  |  | 2,385,000 |  | 1,365,000
Total unrecognized compensation cost related to non-vested awards |  | $ 63,700,000 |  |  |  | $ 63,700,000 |  |
Expected cost recognized over weighted-average period |  |  |  |  |  | 3 years |  |
Shares repurchased during the period to pay for taxes |  | 3,619 |  | 3,582 |  | 164,646 | 225,236 |
Payments of tax withholdings on restricted stock |  | $ 100,000 |  | $ 100,000 |  | $ 4,500,000 | $ 8,700,000 |
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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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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