Basis of presentation - Accounting policies (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 28, 2022	Jan. 29, 2021	Jan. 31, 2020
Revenue recognition
Liability for outstanding gift cards	$ 9.7	$ 8.2
Breakage income related to gift card program	1.7	1.3	$ 1.0
Advertising costs
Advertising costs	117.2	107.4	91.0
Expenses related to vendor funding for cooperative advertising offset	$ 34.3	$ 33.4	$ 34.7
3.25% Senior Notes due April 15, 2023
Other comprehensive income
Credit facility term	10 years