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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		9 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012	Apr. 28, 2012
Net sales:
United States	$ 89,300	$ 94,537	$ 330,995	$ 310,266
Outside U.S.	21,750	28,388	62,845	67,266
Net sales	111,050	122,925	393,840	377,532
Long-lived assets:
United States	60,984		60,984		66,350
Outside U.S.	1,682		1,682		2,046
Long-lived assets	$ 62,666		$ 62,666		$ 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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