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Segment Reporting - Net Sales and Long-lived Assets by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
Net sales:
United States									$ 430,242	$ 405,479	$ 368,979
Outside U.S.									88,080	84,047	72,697
Net sales	124,482	111,050	149,871	132,919	111,994	122,925	135,910	118,698	518,322	489,526	441,676
Long-lived assets:
United States	60,060				66,350				60,060	66,350	68,034
Outside U.S.	1,565				2,046				1,565	2,046	1,832
Long-lived assets	$ 61,625				$ 68,396				$ 61,625	$ 68,396	$ 69,866

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- Definition

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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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 foreign countries in total in which the entity holds assets.

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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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