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Segment Disclosure - Net Sales and Long-lived Assets by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011	Apr. 28, 2012
Net sales:
United States	$ 125,835	$ 117,630	$ 241,494	$ 215,728
Outside U.S.	24,036	18,280	41,296	38,879
Net sales	149,871	135,910	282,790	254,607
Long-lived assets:
United States	62,506		62,506		66,350
Outside U.S.	1,901		1,901		2,046
Long-lived assets	$ 64,407		$ 64,407		$ 68,396

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Amount of 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, located in the entity's country of domicile.

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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.

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