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Property and Equipment, net - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2021
Feb. 02, 2020
Feb. 03, 2019
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 28.3 $ 22.0 $ 17.9
Internal-use software      
Property, Plant and Equipment [Line Items]      
Accumulated depreciation and amortization 22.5 15.9  
Amortization expense $ 7.4 $ 8.6 $ 5.3