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Quarterly Financial Data (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May. 02, 2015	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	Apr. 26, 2014	Jan. 25, 2014	Oct. 26, 2013	Jul. 27, 2013	May. 02, 2015	Apr. 26, 2014	Apr. 27, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 158,086	$ 118,123	$ 173,115	$ 166,618	$ 136,240	$ 115,369	$ 161,639	$ 138,722	$ 615,942	$ 551,970	$ 518,322
Gross profit	35,237	25,062	40,877	43,403	33,754	29,089	43,365	35,502	144,579	141,710	133,894
Net income	$ 3,839	$ 561	$ 7,737	$ 8,745	$ 1,826	$ 2,871	$ 11,790	$ 5,719	$ 20,882	$ 22,206	$ 22,779
Basic earnings per share (in dollars per share)	$ 0.09	$ 0.01	$ 0.18	$ 0.20	$ 0.04	$ 0.07	$ 0.28	$ 0.13	$ 0.48	$ 0.52	$ 0.54
Diluted earnings per share (in dollars per share)	$ 0.09	$ 0.01	$ 0.18	$ 0.20	$ 0.04	$ 0.07	$ 0.27	$ 0.13	$ 0.47	$ 0.51	$ 0.53

X

- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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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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