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Net Income Per Share - Weighted Average Number of Shares Outstanding (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 27, 2013
Jan. 29, 2012
Jan. 27, 2013
Jan. 29, 2012
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]        
Weighted average common shares outstanding, basic 12,095 12,536 12,279 12,777
Dilutive effect of stock-based compensation 195 141 188 141
Weighted average common shares outstanding, diluted 12,290 12,677 12,467 12,918