Revenue (Schedule of Revenue Disaggregation by Product Category) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 30, 2021	Oct. 31, 2020	Oct. 30, 2021	Oct. 31, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 356,336	$ 274,579	$ 1,017,023	$ 722,868
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%
Net sales	$ 356,336	$ 274,579	$ 1,017,023	$ 722,868
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	39.00%	38.00%	44.00%	39.00%
Net sales	$ 138,615	$ 103,985	$ 439,093	$ 282,660
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member] | Women's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	21.00%	20.00%	23.00%	21.00%
Net sales	$ 73,031	$ 54,164	$ 231,702	$ 148,252
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Non-Athletics [Member] | Men's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	12.00%	13.00%	14.00%	13.00%
Net sales	$ 44,226	$ 34,676	$ 140,186	$ 95,710
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%	7.00%	5.00%
Net sales	$ 21,358	$ 15,145	$ 67,205	$ 38,698
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	55.00%	57.00%	50.00%	55.00%
Net sales	$ 196,960	$ 153,952	$ 520,330	$ 399,308
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Women's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	16.00%	19.00%	16.00%	19.00%
Net sales	$ 58,941	$ 50,935	$ 167,184	$ 139,808
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Men's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	21.00%	22.00%	20.00%	23.00%
Net sales	$ 73,429	$ 59,355	$ 206,054	$ 163,757
Sales Revenue Net [Member] | Geographic Concentration Risk [Member] | Athletics [Member] | Children's [Member]
Disaggregation Of Revenue [Line Items]
Percentage of net sales	18.00%	16.00%	14.00%	13.00%
Net sales	$ 64,590	$ 43,662	$ 147,092	$ 95,743
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%	6.00%	6.00%
Net sales	$ 20,761	$ 16,642	$ 57,600	$ 40,900