Organization and summary of significant accounting policies - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Feb. 01, 2020	Feb. 01, 2020 USD ($) Segment	Feb. 02, 2019 USD ($)	Feb. 03, 2018 USD ($)
Organization and critical accounting policies [Abstract]
Number of reportable segments | Segment		3
Advertising and promotional costs [Abstract]
Advertising expense | $		$ 388.9	$ 387.8	$ 360.5
In-house customer finance programs [Abstract]
Interest-free financing period		1 year
Accrued interest suspension period		90 days
Accounts Receivable [Abstract]
Loss allowance, maturity period		90 days
Percentage allowance on losses		100.00%
Minimum
Organization and critical accounting policies [Abstract]
Percent of annual sales	35.00%
Property, Plant and Equipment [Abstract]
Period over which amortization is charged for capitalized payroll for internal use computer projects		3 years
Maximum
Organization and critical accounting policies [Abstract]
Percent of annual sales	40.00%
Property, Plant and Equipment [Abstract]
Period over which amortization is charged for capitalized payroll for internal use computer projects		7 years