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Net Income Per Share - Weighted Average Shares (Detail)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 28, 2013
Jul. 29, 2012
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]    
Weighted average common shares outstanding, basic 12,148 12,551
Dilutive effect of stock-based compensation 218 160
Weighted average common shares outstanding, diluted 12,366 12,711