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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

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