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Stock-Based Compensation - Summary of Grants of Performance Based Restricted Stock Units Associated with Non-Employee (Detail) - Performance Based Restricted Stock Units [Member] - Non-employee [Member] - $ / shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 14, 2016 | Jul. 15, 2015 | Mar. 03, 2015 | Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted Stock Units Awarded | [1] | 11,549 | 10,364 |  |
Vesting Period |  | 3 years | 3 years |  |
Price Per Share | [2] |  |  |  | $ 28.77
Granted on July 14, 2016 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Price Per Share | [3] |  |  |  | 32.10
Granted on July 15, 2015 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Price Per Share | [3] |  |  |  | 32.10
Tranche One [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted Stock Units Awarded | [1] |  |  | 16,000 |
Vesting Period |  |  |  | 28 months |
Tranche One [Member] | Granted on March 3, 2015 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Price Per Share | [3] |  |  |  | 32.10
Tranche Two [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted Stock Units Awarded | [1] |  |  | 12,000 |
Vesting Period |  |  |  | 16 months |
Tranche Two [Member] | Granted on March 3, 2015 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Price Per Share | [2] |  |  |  | $ 28.77
[1] | Amounts represent the maximum number of common stock shares that could be earned if certain performance targets are met as defined in the related restricted stock unit agreements.
[2] | The respective grant vested during the first quarter of fiscal 2017. Accordingly, the price per share represents the closing price of our common stock on the date the award vested.
[3] | The respective grant was unvested at the end of our reporting period. Accordingly, the price per share represents the closing price of our common stock on April 30, 2017, the end of our reporting period.

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- Definition The fair value as of end of vesting period pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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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