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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Income Statement [Abstract]
Net sales	$ 610,530	$ 586,539	$ 570,168
Cost of sales	464,861	446,124	449,149
Gross profit	145,669	140,415	121,019
Operating expenses:
Selling	62,760	61,687	58,812
General and administrative	34,919	34,226	32,801
Product design and development	35,530	29,081	26,911
Total operating expenses	133,209	124,994	118,524
Operating income	12,460	15,421	2,495
Nonoperating income (expense):
Interest income	723	751	987
Interest expense	(217)	(230)	(228)
Other (expense) income, net	(537)	(354)	(128)
Income before income taxes	12,429	15,588	3,126
Income tax expense	6,867	5,246	1,065
Net income	$ 5,562	$ 10,342	$ 2,061
Weighted average shares outstanding:
Basic (in shares)	44,457	44,114	43,990
Diluted (in shares)	44,873	44,303	44,456
Earnings per share:
Basic (in dollars per share)	$ 0.13	$ 0.23	$ 0.05
Diluted (in dollars per share)	$ 0.12	$ 0.23	$ 0.05

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