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Net Income Per Share - Weighted Average Shares (Detail)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 27, 2013
Oct. 28, 2012
Oct. 27, 2013
Oct. 28, 2012
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]        
Weighted average common shares outstanding, basic 12,183 12,191 12,165 12,371
Dilutive effect of stock-based compensation 206 157 226 170
Weighted average common shares outstanding, diluted 12,389 12,348 12,391 12,541