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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Jul. 27, 2013
Jul. 28, 2012
Income Statement [Abstract]    
Net sales $ 138,722 $ 132,919
Cost of goods sold 103,221 96,529
Gross profit 35,501 36,390
Operating expenses:    
Selling expense 13,617 13,080
General and administrative 7,299 6,581
Product design and development 5,989 6,021
Total operating expenses 26,905 25,682
Operating income 8,596 10,708
Nonoperating income (expense):    
Interest income 343 431
Interest expense (115) (87)
Other (expense) income, net (392) (180)
Income before income taxes 8,432 10,872
Income tax expense 2,712 4,194
Net income $ 5,720 $ 6,678
Weighted average shares outstanding:    
Basic (in shares) 42,528 42,068
Diluted (in shares) 42,766 42,141
Earnings per share:    
Basic (in dollars per share) $ 0.13 $ 0.16
Diluted (in dollars per share) $ 0.13 $ 0.16
Cash dividend declared per share (in dollars per share) $ 0.120 $ 0.115