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Stock-Based Compensation - Summary of Vested Performance Based Restricted Stock Units (Detail) - Performance Based Restricted Stock Units [Member] - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Jan. 28, 2018 | Jan. 29, 2017
NEOs and Key Employees [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common Stock Shares Vested | [1] | 102,845 | 37,192
Weighted Average Fair Value | [1],[2] | $ 1,820 | $ 637
Price Per Share | [1],[3] | $ 17.70 | $ 17.12
Non-employee [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common Stock Shares Vested | [4] | 16,000 | 12,000
Weighted Average Fair Value | [2],[4] | $ 520 | $ 345
Price Per Share | [4],[5] | $ 32.50 | $ 28.77
[1] | NEOs and key employees.
[2] | Dollar amounts are in thousands.
[3] | Price per share represents closing price of our common stock on the date of grant.
[4] | Non-employee
[5] | The respective grant vested during the first quarter of fiscal 2018 or 2017, respectively. Accordingly, the price per share represents the closing price of our common stock on the date the award vested.

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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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -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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