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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Income Statement [Abstract]        
Net sales $ 149,871 $ 135,910 $ 282,790 $ 254,607
Cost of goods sold 107,519 104,440 204,048 193,631
Gross profit 42,352 31,470 78,742 60,976
Operating expenses:        
Selling expense 12,796 12,926 25,876 25,135
General and administrative 6,850 6,972 13,431 13,436
Product design and development 5,845 5,636 11,866 11,353
Total operating expenses 25,491 25,534 51,173 49,924
Operating income 16,861 5,936 27,569 11,052
Nonoperating income (expense):        
Interest income 348 457 779 892
Interest expense (36) (95) (123) (171)
Other income (expense), net 150 (47) (30) (193)
Income before income taxes 17,323 6,251 28,195 11,580
Income tax expense 5,776 2,292 9,970 4,253
Net income $ 11,547 $ 3,959 $ 18,225 $ 7,327
Weighted average shares outstanding:        
Basic (in shares) 42,163 41,792 42,138 41,759
Diluted (in shares) 42,316 41,934 42,287 41,938
Earnings per share:        
Basic (in dollars per share) $ 0.27 $ 0.09 $ 0.43 $ 0.18
Diluted (in dollars per share) $ 0.27 $ 0.09 $ 0.43 $ 0.17
Cash dividends declared per share $ 0.000 $ 0.00 $ 0.115 $ 0.11