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Fair Value Measurements - Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
May 02, 2020
Aug. 03, 2019
Debt Securities, Available-for-sale [Line Items]    
One Year or Less $ 144,744 $ 143,276
Over One Year Through Five Years 86,919 53,372
Over Five Years 0 0
Total 231,663 196,648
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 45,495 44,772
Over One Year Through Five Years 24,857 5,135
Over Five Years 0 0
Total 70,352 49,907
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 31,154 29,761
Over One Year Through Five Years 0 0
Over Five Years 0 0
Total 31,154 29,761
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 6,162 5,412
Over One Year Through Five Years 40,748 37,320
Over Five Years 0 0
Total 46,910 42,732
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
One Year or Less 61,933 63,331
Over One Year Through Five Years 21,314 10,917
Over Five Years 0 0
Total $ 83,247 $ 74,248