Segment reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 01, 2019 USD ($) segment	Nov. 02, 2018 USD ($) segment	Nov. 01, 2019 USD ($) segment	Nov. 02, 2018 USD ($) segment
Net sales data for classes of similar products
Net sales	$ 6,991,393	$ 6,417,462	$ 20,596,331	$ 18,975,234
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	$ 5,523,157	$ 5,058,839	$ 16,164,317	$ 14,819,290
Seasonal
Net sales data for classes of similar products
Net sales	750,843	687,640	2,341,914	2,171,184
Home products
Net sales data for classes of similar products
Net sales	400,934	371,833	1,151,715	1,071,627
Apparel
Net sales data for classes of similar products
Net sales	$ 316,459	$ 299,150	$ 938,385	$ 913,133