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Employee Stock Plans - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 03, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payments of tax withholdings on restricted stock |  | $ 4,442,000 | $ 8,591,000 |
Shares repurchased during the period, value |  | $ 4,442,000 | $ 21,329,000 |
Treasury Stock, Common |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares repurchased during the period |  | 0 | 324,100 |
Shares repurchased during the period, value |  |  | $ 12,700,000 |
ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future issuance |  | 600,000 |  |
Authorized payroll deductions |  | 15.00% |  |
Authorized payroll deductions, value |  | $ 25,000 |  |
Maximum number of shares reserved for issuance |  | 3,000,000.0 |  |
Employees stock purchased |  | 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 |  |
Total unrecognized compensation cost related to non-vested awards |  | $ 8,300,000 |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares outstanding |  | 2,363,000 |  | 1,365,000
Total unrecognized compensation cost related to non-vested awards |  | $ 69,000,000.0 |  |
Expected cost recognized over weighted-average period |  | 3 years 2 months 12 days |  |
Shares repurchased during the period to pay for taxes |  | 161,027 | 221,654 |
Payments of tax withholdings on restricted stock |  | $ 4,400,000 | $ 8,600,000 |
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 Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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