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Employee Stock Plans - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2019 USD ($) $ / shares shares | Jul. 31, 2018 USD ($) $ / shares shares | Apr. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Payments of tax withholdings on restricted stock | $ | $ 8,591,000 | $ 13,054,000 |
Shares repurchased during the period, value | $ | $ 21,329,000 | $ 13,054,000 |
Treasury Stock, Common |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares repurchased during the period | 324,100 | 0 |
Shares repurchased during the period, value | $ | $ 12,700,000 |  |
ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares reserved for issuance | 3,000,000.0 |  |
Authorized payroll deductions | 15.00% |  |
Fair market price of common stock | 85.00% |  |
Authorized payroll deductions, value | $ | $ 25,000 |  |
Shares available for future issuance | 800,000 |  |
Employees stock purchased | 126,604 | 75,106 |
Employees stock purchased, price per share | $ / shares | $ 34.06 | $ 52.64 |
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 | 500,000 |  |
Total unrecognized compensation cost related to non-vested awards | $ | $ 17,900,000 |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares outstanding | 1,409,000 |  | 1,460,000
Total unrecognized compensation cost related to non-vested awards | $ | $ 51,200,000 |  |
Expected cost recognized over weighted-average period | 2 years 9 months 18 days |  |
Shares repurchased during the period to pay for taxes | 221,654 | 199,795 |
Payments of tax withholdings on restricted stock | $ | $ 8,600,000 | $ 13,100,000 |
Stock Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock incentive plan, additional number of shares | 5,500,000 |  |
Maximum number of shares reserved for issuance | 11,200,000 |  |
Issuance of full-value stock awards limitation, required ratio to stock options | 2.3 |  |

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- Definition The maximum value that an employee can purchase of shares through the ESPP in an annual period. + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 + Details
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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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=116856206&loc=d3e5070-113901 + Details
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