CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019
Income Statement [Abstract]
Net sales	$ 127,367	$ 174,911	$ 271,011	$ 355,167
Cost of sales	94,053	134,824	201,936	269,575
Gross profit	33,314	40,087	69,075	85,592
Operating expenses:
Selling	12,654	16,177	24,210	34,474
General and administrative	7,264	8,965	14,388	18,058
Product design and development	6,737	10,121	14,269	20,621
Total operating expenses	26,655	35,263	52,867	73,153
Operating income	6,659	4,824	16,208	12,439
Nonoperating (expense) income:
Interest income	66	162	151	431
Interest expense	(84)	(31)	(157)	(66)
Other (expense) income, net	(837)	(514)	(1,464)	(321)
Income before income taxes	5,804	4,441	14,738	12,483
Income tax expense (benefit)	2,388	(2,833)	3,855	(1,821)
Net income	$ 3,416	$ 7,274	$ 10,883	$ 14,304
Weighted average shares outstanding:
Basic (in shares)	44,893	45,115	44,808	45,114
Diluted (in shares)	44,977	45,267	44,947	45,361
Earnings per share:
Basic (in dollars per share)	$ 0.08	$ 0.16	$ 0.24	$ 0.32
Diluted (in dollars per share)	$ 0.08	$ 0.16	$ 0.24	$ 0.32