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CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 29, 2011
Oct. 30, 2010
Oct. 29, 2011
Oct. 30, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]        
Net sales $ 135,910 $ 126,919 $ 254,607 $ 227,421
Cost of goods sold 104,440 94,102 193,631 168,017
Gross profit 31,470 32,817 60,976 59,404
Operating expenses:        
Selling expense 12,926 12,600 25,135 24,936
General and administrative 6,972 5,624 13,436 11,212
Product design and development 5,636 4,561 11,353 9,114
Total operating expenses 25,534 22,785 49,924 45,262
Operating income 5,936 10,032 11,052 14,142
Nonoperating income (expense):        
Interest income 457 383 892 838
Interest expense (95) (41) (171) (77)
Other (expense) income, net (47) 167 (193) 262
Income before income taxes 6,251 10,541 11,580 15,165
Income tax expense 2,292 3,534 4,253 5,715
Net income $ 3,959 $ 7,007 $ 7,327 $ 9,450
Weighted average shares outstanding:        
Basic (in shares) 41,792 41,387 41,759 41,440
Diluted (in shares) 41,934 41,647 41,938 41,788
Earnings per share:        
Basic (in dollars per share) $ 0.09 $ 0.17 $ 0.18 $ 0.23
Diluted (in dollars per share) $ 0.09 $ 0.17 $ 0.17 $ 0.23
Cash dividend paid per share (in dollars per share) $ 0.00 $ 0.50 $ 0.11 $ 0.60