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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Oct. 29, 2016
Oct. 31, 2015
Oct. 29, 2016
Oct. 31, 2015
Income Statement [Abstract]        
Net sales $ 169,992 $ 157,668 $ 327,138 $ 307,889
Cost of goods sold 125,684 122,155 243,763 236,875
Gross profit 44,308 35,513 83,375 71,014
Operating expenses:        
Selling expense 15,891 14,825 31,150 29,089
General and administrative 8,625 8,116 17,408 16,286
Product design and development 7,126 6,975 14,169 13,943
Total operating expenses 31,642 29,916 62,727 59,318
Operating income 12,666 5,597 20,648 11,696
Nonoperating income (expense):        
Interest income 171 266 376 564
Interest expense (76) (28) (118) (90)
Other income (expense), net 149 (231) 55 (674)
Income before income taxes 12,910 5,604 20,961 11,496
Income tax expense 3,889 2,436 6,401 4,552
Net income $ 9,021 $ 3,168 $ 14,560 $ 6,944
Weighted average shares outstanding:        
Basic (in shares) 43,988 43,934 44,051 43,890
Diluted (in shares) 44,098 44,113 44,168 44,255
Earnings per share:        
Basic (in dollars per share) $ 0.21 $ 0.07 $ 0.33 $ 0.16
Diluted (in dollars per share) 0.20 0.07 0.33 0.16
Cash dividend declared per share (in dollars per share) $ 0.07 $ 0.10 $ 0.17 $ 0.20