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Investments - Narrative (Details) - USD ($) $ in Thousands | Jul. 28, 2019 | Jan. 27, 2019
--- | --- | ---
Investment [Line Items] |  |
Debt securities available for sale | $ 7,922 | $ 3,105
Convertible debt |  |
Investment [Line Items] |  |
Debt securities available for sale | $ 7,922 | $ 3,105
Convertible Debt |  |
Investment [Line Items] |  |
Interest rate | 12.00% |
Privately Held Company (The Investee) | Convertible debt |  |
Investment [Line Items] |  |
Debt securities available for sale | $ 3,200 |

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