Organization and summary of significant accounting policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 30, 2021	Feb. 01, 2020	Feb. 02, 2019
Non-cash investing activities:
Capital expenditures in accounts payable	$ 1.2	$ 0.1	$ 5.6
Supplemental cash flow information:
Interest paid	30.5	34.7	39.1
Income tax paid (refunded), net	(176.0)	$ 5.7	$ (44.8)
CARES Act, income tax refunded	$ 183.4