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Investments - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 26, 2020 | Jan. 27, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale securities | $ 10,700 | $ 3,105
Available-for-sale, realized gain (loss) | (700) |
Convertible Notes Payable |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale securities | $ 3,200 |
Interest rate | 12.00% |

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