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Segment Information - International net sales (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 27, 2014	Jan. 26, 2014	Oct. 27, 2013	Jul. 28, 2013	Apr. 28, 2013	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Apr. 27, 2014	Apr. 28, 2013	Apr. 29, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales	$ 74,043	$ 72,389	$ 70,589	$ 70,141	$ 70,375	$ 63,695	$ 65,560	$ 69,184	$ 287,162	$ 268,814	$ 254,443
North america (excluding USA) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									15,556	11,900	10,417
Far east and asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									33,487	43,907	38,279
All other areas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									6,041	5,806	5,353
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
net sales									$ 55,084	$ 61,613	$ 54,049

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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

-Paragraph 1

-Article 5

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