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Quarterly Financial Data (Unaudited) - (Details) (USD $) In Thousands, except Per Share data, 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
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 124,482	$ 111,050	$ 149,871	$ 132,919	$ 111,994	$ 122,925	$ 135,910	$ 118,698	$ 518,322	$ 489,526	$ 441,676
Gross profit	28,103	27,049	42,352	36,390	24,606	27,855	31,470	29,507	133,894	113,437	111,484
Net income	$ 1,844	$ 2,710	$ 11,547	$ 6,678	$ (505)	$ 1,666	$ 3,959	$ 3,368	$ 22,779	$ 8,489	$ 14,244
Basic earnings per share (in dollars per share)	$ 0.04	$ 0.06	$ 0.27	$ 0.16	$ (0.01)	$ 0.04	$ 0.09	$ 0.08	$ 0.54	$ 0.20	$ 0.34
Diluted earnings per share (in dollars per share)	$ 0.04	$ 0.06	$ 0.27	$ 0.16	$ (0.01)	$ 0.04	$ 0.09	$ 0.08	$ 0.53	$ 0.20	$ 0.34

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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