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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Aug. 02, 2014
Jul. 27, 2013
Income Statement [Abstract]    
Net sales $ 166,618 $ 138,722
Cost of goods sold 123,215 103,221
Gross profit 43,403 35,501
Operating expenses:    
Selling expense 15,046 13,617
General and administrative 7,937 7,299
Product design and development 6,803 5,989
Total operating expenses 29,786 26,905
Operating income 13,617 8,596
Nonoperating income (expense):    
Interest income 300 343
Interest expense (68) (115)
Other (expense) income, net (172) (392)
Income before income taxes 13,677 8,432
Income tax expense 4,932 2,712
Net income $ 8,745 $ 5,720
Weighted average shares outstanding:    
Basic (in shares) 43,261 42,528
Diluted (in shares) 43,641 42,766
Earnings per share:    
Basic (in dollars per share) $ 0.20 $ 0.13
Diluted (in dollars per share) $ 0.20 $ 0.13
Cash dividend declared per share (in dollars per share) $ 0.100 $ 0.120