Revenue (Schedule of Revenue Disaggregation by Product Category) (Details) - USD ($) $ in Thousands	3 Months Ended
	May 01, 2021	May 02, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 328,457	$ 147,495
Non-Athletics [Member]
Disaggregation Of Revenue [Line Items]
Net sales	143,106	54,645
Non-Athletics [Member] | Women's [Member]
Disaggregation Of Revenue [Line Items]
Net sales	75,531	28,921
Non-Athletics [Member] | Men's [Member]
Disaggregation Of Revenue [Line Items]
Net sales	44,282	18,715
Non-Athletics [Member] | Children's [Member]
Disaggregation Of Revenue [Line Items]
Net sales	23,293	7,009
Athletics [Member]
Disaggregation Of Revenue [Line Items]
Net sales	166,897	85,036
Athletics [Member] | Women's [Member]
Disaggregation Of Revenue [Line Items]
Net sales	58,595	32,912
Athletics [Member] | Men's [Member]
Disaggregation Of Revenue [Line Items]
Net sales	65,724	31,460
Athletics [Member] | Children's [Member]
Disaggregation Of Revenue [Line Items]
Net sales	42,578	20,664
Accessories and Other [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 18,454	$ 7,814
Sales Revenue Net [Member] | Geographic Concentration Risk [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	100.00%	100.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	43.00%	38.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member] | Women's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	23.00%	20.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member] | Men's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	13.00%	13.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member] | Children's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	7.00%	5.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	51.00%	57.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Women's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	18.00%	22.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Men's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	20.00%	21.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Children's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	13.00%	14.00%
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Accessories and Other [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	6.00%	5.00%