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Net Income Per Share - Narrative (Detail) | 3 Months Ended | 9 Months Ended |
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Jan. 26, 2014 | Jan. 26, 2014 | Feb. 01, 2015
Earnings Per Share Disclosure [Line Items] |  |  |
Number of shares of common stock excluded from the computation of basic net income | 61,667 us-gaap_WeightedAverageNumberOfSharesRestrictedStock | 61,667 us-gaap_WeightedAverageNumberOfSharesRestrictedStock |
Time Vested Restricted Stock Awards [Member] |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |
Number of shares outstanding and unvested of common stock not affecting computation of basic net income per share |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2646-109256 + Details
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