Segment reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020 USD ($) segment	Aug. 02, 2019 USD ($) segment	Jul. 31, 2020 USD ($) segment	Aug. 02, 2019 USD ($) segment
Net sales data for classes of similar products
Net sales	$ 8,684,241	$ 6,981,753	$ 17,132,690	$ 13,604,938
Number of reportable segments
Number of reportable operating segments | segment	1	1	1	1
Consumables
Net sales data for classes of similar products
Net sales	$ 6,496,350	$ 5,428,005	$ 13,199,799	$ 10,641,160
Seasonal
Net sales data for classes of similar products
Net sales	1,161,611	854,093	2,079,523	1,591,071
Home products
Net sales data for classes of similar products
Net sales	586,021	375,068	1,084,303	750,781
Apparel
Net sales data for classes of similar products
Net sales	$ 440,259	$ 324,587	$ 769,065	$ 621,926