Summarized Quarterly Data (unaudited) - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 01, 2020	Nov. 02, 2019	Aug. 03, 2019	May 04, 2019	Feb. 02, 2019	Nov. 03, 2018	Aug. 04, 2018	May 05, 2018	Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018
Summarized Quarterly Data (unaudited)
Net sales	$ 297,596	$ 241,221	$ 302,000	$ 281,973	$ 298,535	$ 233,662	$ 302,641	$ 272,628	$ 1,122,790	$ 1,107,466	$ 1,086,211
Gross profit	166,393	132,980	179,825	165,769	164,402	129,279	179,297	164,146	644,967	637,124	612,632
Operating income	21,080	2,594	40,259	29,742	22,001	3,705	36,513	28,373	93,675	90,592	86,000
Net earnings, basic	15,332	1,668	29,836	21,657	16,679	1,861	27,184	20,567	68,493	66,291	65,090
Net earnings, diluted	$ 15,332	$ 1,668	$ 29,836	$ 21,657	$ 16,679	$ 1,861	$ 27,184	$ 20,567	$ 68,493	$ 66,291	$ 65,090
Net earnings per share:
Basic (in dollars per share)	$ 0.91	$ 0.10	$ 1.78	$ 1.30	$ 1.00	$ 0.11	$ 1.63	$ 1.24	$ 4.09	$ 3.97	$ 3.92
Diluted (in dollars per share)	$ 0.90	$ 0.10	$ 1.76	$ 1.29	$ 0.99	$ 0.11	$ 1.61	$ 1.23	$ 4.05	$ 3.94	$ 3.89
Weighted average shares outstanding:
Basic (in shares)	16,779	16,773	16,760	16,713	16,698	16,694	16,683	16,639	16,756	16,678	16,600
Diluted (in shares)	16,965	16,934	16,907	16,848	16,890	16,870	16,840	16,769	16,914	16,842	16,734
LIFO accounting charge (credit)	$ 1,000				$ 1,000				$ 1,000	$ 1,000