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Summary of Significant Accounting Policies (Property and Equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 30, 2021
Feb. 01, 2020
Feb. 02, 2019
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 69,345 $ 54,979 $ 41,451
Property and equipment, gross 843,370 654,157  
Less: Accumulated depreciation and amortization (278,019) (215,071)  
Property and equipment, net 565,351 439,086  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 23,541 14,773  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 261,324 202,340  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 10 years    
Property and equipment, gross $ 319,353 240,664  
Computer and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 164,765 117,803  
Construction in process [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 74,387 $ 78,577  
Minimum [Member] | Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 3 years    
Maximum [Member] | Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 10 years