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Nature of Business and Summary of Significant Accounting Policies - Advertising Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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May. 02, 2015 | Apr. 26, 2014 | Apr. 27, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Advertising expense | $ 2,318 | $ 1,694 | $ 1,584

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
Name: | us-gaap_AdvertisingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration