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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. 26, 2013
Oct. 27, 2012
Oct. 26, 2013
Oct. 27, 2012
Income Statement [Abstract]        
Net sales $ 161,639 $ 149,871 $ 300,361 $ 282,790
Cost of goods sold 118,274 107,519 221,494 204,048
Gross profit 43,365 42,352 78,867 78,742
Operating expenses:        
Selling expense 13,304 12,796 26,922 25,876
General and administrative 6,804 6,850 14,103 13,431
Product design and development 5,692 5,845 11,681 11,866
Total operating expenses 25,800 25,491 52,706 51,173
Operating income 17,565 16,861 26,161 27,569
Nonoperating income (expense):        
Interest income 312 348 655 779
Interest expense (12) (36) (127) (123)
Other income (expense), net 278 150 (114) (30)
Income before income taxes 18,143 17,323 26,575 28,195
Income tax expense 6,353 5,776 9,066 9,970
Net income $ 11,790 $ 11,547 $ 17,509 $ 18,225
Weighted average shares outstanding:        
Basic (in shares) 42,709 42,163 42,639 42,138
Diluted (in shares) 43,002 42,316 43,023 42,287
Earnings per share:        
Basic (in dollars per share) $ 0.28 $ 0.27 $ 0.41 $ 0.43
Diluted (in dollars per share) $ 0.27 $ 0.27 $ 0.41 $ 0.43
Cash dividend declared per share (in dollars per share) $ 0.090 $ 0.000 $ 0.210 $ 0.115