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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Income Statement [Abstract]        
Net sales $ 172,692 $ 169,309 $ 326,880 $ 342,037
Cost of sales 129,935 126,705 245,876 254,787
Gross profit 42,757 42,604 81,004 87,250
Operating expenses:        
Selling 16,125 15,350 32,503 30,289
General and administrative 8,574 8,868 17,111 17,803
Product design and development 9,039 8,948 18,331 17,995
Total operating expenses 33,738 33,166 67,945 66,087
Operating income 9,019 9,438 13,059 21,163
Nonoperating income (expense):        
Interest income 188 151 385 362
Interest expense (2) (47) (41) (133)
Other (expense) income, net (66) (87) (220) 58
Income before income taxes 9,139 9,455 13,183 21,450
Income tax expense 533 2,323 3 5,889
Net income $ 8,606 $ 7,132 $ 13,180 $ 15,561
Weighted average shares outstanding:        
Basic (in shares) 44,780 44,412 44,717 44,345
Diluted (in shares) 44,950 44,679 44,994 44,696
Earnings per share:        
Basic (in dollars per share) $ 0.19 $ 0.16 $ 0.29 $ 0.35
Diluted (in dollars per share) $ 0.19 $ 0.16 $ 0.29 $ 0.35