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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 01, 2014
Oct. 26, 2013
Nov. 01, 2014
Oct. 26, 2013
Income Statement [Abstract]        
Net sales $ 173,115 $ 161,639 $ 339,733 $ 300,361
Cost of goods sold 132,238 118,274 255,453 221,494
Gross profit 40,877 43,365 84,280 78,867
Operating expenses:        
Selling expense 14,665 13,304 29,711 26,922
General and administrative 7,820 6,804 15,757 14,103
Product design and development 6,150 5,692 12,953 11,681
Total operating expenses 28,635 25,800 58,421 52,706
Operating income 12,242 17,565 25,859 26,161
Nonoperating income (expense):        
Interest income 275 312 575 655
Interest expense (56) (12) (124) (127)
Other (expense) income, net (225) 278 (397) (114)
Income before income taxes 12,236 18,143 25,913 26,575
Income tax expense 4,499 6,353 9,431 9,066
Net income $ 7,737 $ 11,790 $ 16,482 $ 17,509
Weighted average shares outstanding:        
Basic (in shares) 43,405 42,709 43,350 42,639
Diluted (in shares) 43,798 43,002 43,926 43,023
Earnings per share:        
Basic (in dollars per share) $ 0.18 $ 0.28 $ 0.38 $ 0.41
Diluted (in dollars per share) $ 0.18 $ 0.27 $ 0.38 $ 0.41
Cash dividend declared per share (in dollars per share) $ 0.100 $ 0.090 $ 0.200 $ 0.210