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Segment Reporting - Net Sales and Long-lived Assets by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Net sales:
Net sales	$ 551,970	$ 518,322	$ 489,526
Long-lived assets:
Long-lived assets	65,270	61,625	68,396
United States
Net sales:
Net sales	453,468	430,242	405,479
Long-lived assets:
Long-lived assets	60,846	60,060	66,350
Outside U.S.
Net sales:
Net sales	98,502	88,080	84,047
Long-lived assets:
Long-lived assets	$ 4,424	$ 1,565	$ 2,046

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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)

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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=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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