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Segment Reporting - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2016 | May 02, 2015 | Apr. 26, 2014
Net sales: |  |  |
Net sales | $ 570,168 | $ 615,942 | $ 551,970
Long-lived assets: |  |  |
Long-lived assets | 73,163 | 72,844 | 65,270
United States |  |  |
Net sales: |  |  |
Net sales | 465,598 | 494,860 | 453,468
Long-lived assets: |  |  |
Long-lived assets | 68,233 | 67,882 | 60,846
Outside U.S. |  |  |
Net sales: |  |  |
Net sales | 104,570 | 121,082 | 98,502
Long-lived assets: |  |  |
Long-lived assets | $ 4,930 | $ 4,962 | $ 4,424

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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