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Financial Instruments - Schedule of Gross Unrealized Losses and Fair Values for Investments that were in Continuous Unrealized Loss Position for Less Than 12 Months, Aggregated by Investments Category (Details) - USD ($)
$ in Thousands
Feb. 02, 2020
Jan. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less then 12 months $ 14,689 $ 276,192
Unrealized Loss, Less then 12 months (4) (282)
Fair Value Greater then 12 months 1,000 160,927
Unrealized Loss, Greater then 12 months 0 (956)
Fair Value Total 15,689 437,119
Unrealized Loss Total (4) (1,238)
Asset-backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less then 12 months   11,194
Unrealized Loss, Less then 12 months   (12)
Fair Value Greater then 12 months   0
Unrealized Loss, Greater then 12 months   0
Fair Value Total   11,194
Unrealized Loss Total   (12)
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less then 12 months 9,691 83,577
Unrealized Loss, Less then 12 months (1) (152)
Fair Value Greater then 12 months 0 96,914
Unrealized Loss, Greater then 12 months 0 (605)
Fair Value Total 9,691 180,491
Unrealized Loss Total (1) (757)
US Government Agencies Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less then 12 months 4,998 24,892
Unrealized Loss, Less then 12 months (3) (20)
Fair Value Greater then 12 months 0 23,600
Unrealized Loss, Greater then 12 months 0 (134)
Fair Value Total 4,998 48,492
Unrealized Loss Total (3) (154)
US Government Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less then 12 months 0 156,529
Unrealized Loss, Less then 12 months 0 (98)
Fair Value Greater then 12 months 1,000 40,413
Unrealized Loss, Greater then 12 months 0 (217)
Fair Value Total 1,000 196,942
Unrealized Loss Total $ 0 $ (315)