Leases (Narrative) (Details) ft² in Thousands, $ in Millions	3 Months Ended	9 Months Ended
	Nov. 02, 2019 USD ($) ft² warehouse stores	Nov. 02, 2019 USD ($) ft² warehouse renewal_option stores
Lessee, Lease, Description [Line Items]
Number of real estate properties | stores	2	2
Operating lease, contract renewal option, term	5 years	5 years
Operating leases, weighted average remaining lease term	10 years 9 months 18 days	10 years 9 months 18 days
Operating leases, weighted average discount rate (percentage)	3.50%	3.50%
Operating leases, weighted average remaining lease term, excluding ground leases		6 years 2 months 12 days
Operating leases, excluding ground leases, weighted average discount rate (percentage)		0.032
Cash payments made for operating leases | $	$ 152.1	$ 453.9
Operating lease assets and liabilities, net | $	$ 251.4	$ 586.8
Los Angeles
Lessee, Lease, Description [Line Items]
Office space leased by company, square footage | ft²	103	103
Boston
Lessee, Lease, Description [Line Items]
Office space leased by company, square footage | ft²	5	5
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, contract terms	3 years	3 years
Number of options to renew store lease for five year period | renewal_option		3
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, contract terms	10 years	10 years
Number of options to renew store lease for five year period | renewal_option		4
Distribution Centers and Warehouses
Lessee, Lease, Description [Line Items]
Number of warehouses leased | warehouse	5	5
Affiliated Entity | Distribution Centers and Warehouses
Lessee, Lease, Description [Line Items]
Number of warehouses leased | warehouse	4	4