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Fair Value Measurements - Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Aug. 03, 2019
Apr. 27, 2019
Debt Securities, Available-for-sale [Line Items]    
One Year or Less $ 143,276  
Over One Year Through Five Years 53,372  
Over Five Years 0  
Debt Securities, Available-for-sale 196,648  
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 44,772  
Over One Year Through Five Years 5,135  
Over Five Years   $ 0
Debt Securities, Available-for-sale 49,907  
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 29,761  
Over One Year Through Five Years 0  
Over Five Years   0
Debt Securities, Available-for-sale 29,761  
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 5,412  
Over One Year Through Five Years 37,320  
Over Five Years   0
Debt Securities, Available-for-sale 42,732  
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 63,331  
Over One Year Through Five Years 10,917  
Over Five Years   $ 0
Debt Securities, Available-for-sale $ 74,248