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Net Income Per Share - Weighted Average Number of Shares Outstanding (Detail)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 28, 2012
Oct. 30, 2011
Oct. 28, 2012
Oct. 30, 2011
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]        
Weighted average common shares outstanding, basic 12,191 12,733 12,371 12,898
Dilutive effect of stock-based compensation 157 138 170 127
Weighted average common shares outstanding, diluted 12,348 12,871 12,541 13,025