Segment Reporting - Net Sales and Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	3 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	May 02, 2020	Apr. 27, 2019	Apr. 28, 2018
Net sales:
Net sales	$ 126,108	$ 127,657	$ 174,911	$ 180,256	$ 127,755	$ 115,069	$ 172,692	$ 154,188	$ 608,932	$ 569,704	$ 610,530
Long-lived assets:
Long-lived assets	67,484				65,314				67,484	65,314	68,059
United States
Net sales:
Net sales									504,931	460,099	501,646
Long-lived assets:
Long-lived assets	58,422				59,192				58,422	59,192	61,206
Outside United States
Net sales:
Net sales									104,001	109,605	108,884
Long-lived assets:
Long-lived assets	$ 9,062				$ 6,122				$ 9,062	$ 6,122	$ 6,853