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Property and equipment (Details) - USD ($)
$ in Thousands
Feb. 01, 2020
Feb. 03, 2019
Feb. 02, 2019
Property and equipment      
Property and equipment, gross $ 2,565,840   $ 2,375,136
Less: accumulated depreciation and amortization (1,360,316)   (1,149,107)
Property and equipment, net 1,205,524 $ 1,209,046 1,226,029
Equipment and fixtures      
Property and equipment      
Property and equipment, gross 1,073,764   994,668
Leasehold improvements      
Property and equipment      
Property and equipment, gross 803,398   785,276
Electronic equipment and software      
Property and equipment      
Property and equipment, gross 596,323   544,618
Construction-in-progress      
Property and equipment      
Property and equipment, gross $ 92,355   $ 50,574