Quarterly Financial Data (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								9 Months Ended	12 Months Ended
	May 02, 2020	Feb. 01, 2020	Nov. 02, 2019	Aug. 03, 2019	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Jan. 26, 2019	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 126,108	$ 127,657	$ 174,911	$ 180,256	$ 127,755	$ 115,069	$ 172,692	$ 154,188		$ 608,932	$ 569,704	$ 610,530
Gross profit	28,626	24,482	40,087	45,505	24,421	24,869	42,757	38,247		138,700	130,294	145,669
Net income (loss)	$ (1,079)	$ (12,734)	$ 7,274	$ 7,030	$ (10,819)	$ (3,319)	$ 8,606	$ 4,574		$ 491	$ (958)	$ 5,562
Basic earnings (loss) per share (in dollars per share)	$ (0.02)	$ (0.28)	$ 0.16	$ 0.16	$ (0.24)	$ (0.07)	$ 0.19	$ 0.10		$ 0.01	$ (0.02)	$ 0.13
Diluted earnings (loss) per share (in dollars per share)	$ (0.02)	$ (0.28)	$ 0.16	$ 0.16	$ (0.24)	$ (0.07)	$ 0.19	$ 0.10		$ 0.01	$ (0.02)	$ 0.12
Tariff expense										$ 4,927	$ 6,300
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations									$ 2,775	$ 159	$ 2,741
Deferred Other Tax Expense (Benefit)									$ 480