Note 13 - Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 01, 2021	Jan. 30, 2021	Oct. 31, 2020	Aug. 01, 2020	May 02, 2020	Jan. 25, 2020	Oct. 26, 2019	Jul. 27, 2019	May 01, 2021	May 02, 2020	Apr. 27, 2019
Net sales	$ 261,103	$ 245,931	$ 271,809	$ 293,367	$ 262,401	$ 222,814	$ 251,611	$ 263,568	$ 1,072,210	$ 1,000,394	$ 1,014,105
Gross profit	100,685	95,664	108,049	117,218	98,657	82,095	92,814	96,574	421,616	370,140	384,350
Net income	$ 39,131	$ 36,687	$ 47,164	$ 51,164	$ 36,213	$ 26,563	$ 32,654	$ 34,542	$ 174,146	$ 129,972	$ 140,853
Earnings per common share – basic (in dollars per share)	$ 42	$ 39	$ 51	$ 55	$ 39	$ 28	$ 35	$ 37	$ 1.87	$ 1.39	$ 1.51
Earnings per common share – diluted (in dollars per share)	$ 42	$ 39	$ 51	$ 54	$ 39	$ 28	$ 35	$ 37	$ 1.86	$ 1.39	$ 1.50