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Investments - Summary of Maturities of Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Jul. 28, 2019
Jan. 27, 2019
Market Value    
Within 1 year $ 1,013 $ 3,105
After 1 year through 5 years 6,909 0
Total available-for-sale securities 7,922 3,105
Within 1 year 1,013 3,105
After 1 year through 5 years 6,909 0
Total available-for-sale securities $ 7,922 $ 3,105