Revenue (Schedule of Revenue Disaggregation by Product Category) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 01, 2020	Aug. 03, 2019	Aug. 01, 2020	Aug. 03, 2019
Disaggregation Of Revenue [Line Items]
Net sales	$ 300,794	$ 268,221	$ 448,289	$ 522,031
Non-Athletics [Member]
Disaggregation Of Revenue [Line Items]
Net sales	124,030	119,952	178,675	228,613
Non-Athletics [Member] | Women' s [Member]
Disaggregation Of Revenue [Line Items]
Net sales	65,167	66,277	94,088	126,707
Non-Athletics [Member] | Men' s [Member]
Disaggregation Of Revenue [Line Items]
Net sales	42,319	40,108	61,034	75,971
Non-Athletics [Member] | Children' s [Member]
Disaggregation Of Revenue [Line Items]
Net sales	16,544	13,567	23,553	25,935
Athletics [Member]
Disaggregation Of Revenue [Line Items]
Net sales	160,319	135,571	245,355	269,380
Athletics [Member] | Women' s [Member]
Disaggregation Of Revenue [Line Items]
Net sales	55,961	43,027	88,873	92,714
Athletics [Member] | Men' s [Member]
Disaggregation Of Revenue [Line Items]
Net sales	72,941	56,837	104,401	110,141
Athletics [Member] | Children' s [Member]
Disaggregation Of Revenue [Line Items]
Net sales	31,417	35,707	52,081	66,525
Accessories and Other [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 16,445	$ 12,698	$ 24,259	$ 24,038
Sales Revenue Net [Member] | Geographic Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%	100.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	42.00%	45.00%	40.00%	44.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member] | Women' s [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	22.00%	25.00%	21.00%	24.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member] | Men' s [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	14.00%	15.00%	14.00%	15.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member] | Children' s [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	6.00%	5.00%	5.00%	5.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	53.00%	50.00%	55.00%	52.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Women' s [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	19.00%	16.00%	20.00%	18.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Men' s [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	24.00%	21.00%	23.00%	21.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Children' s [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	10.00%	13.00%	12.00%	13.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Accessories and Other [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	5.00%	5.00%	5.00%	4.00%