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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 | Jul. 13, 2017 | Jul. 14, 2016 | Jul. 15, 2015 | Apr. 29, 2018
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted Stock Units Awarded | [1] | 10,200 | 11,549 | 10,364 |
Vesting Period |  | 3 years | 3 years | 3 years |
Granted on July 13, 2017 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Price Per Share | [2] |  |  |  | $ 30.10
Granted on July 14, 2016 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Price Per Share | [2] |  |  |  | 30.10
Granted on July 15, 2015 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Price Per Share | [2] |  |  |  | $ 30.10
[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 was unvested at the end of our reporting period. Accordingly, the price per share represents the closing price of our common stock on April 29, 2018, the end of our reporting period.

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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=96867065&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=96867065&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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