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Fair Value Measurements - Financial Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Apr. 28, 2019 | Jan. 27, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset | $ 8 | $ 69
Total financial assets | 3,613 | 3,174
Derivative financial instruments | 18 | 0
Total financial liabilities | 480 | 2,623
(Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Total financial assets | 0 | 0
Derivative financial instruments | 0 | 0
Total financial liabilities | 0 | 0
(Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset | 8 | 69
Total financial assets | 8 | 69
Derivative financial instruments | 18 | 0
Total financial liabilities | 18 | 0
(Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Total financial assets | 3,605 | 3,105
Derivative financial instruments | 0 | 0
Total financial liabilities | 462 | 2,623
Convertible debt |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 3,605 | 3,105
Convertible debt | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Convertible debt | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Convertible debt | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 3,605 | 3,105
AptoVision |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 2,161
AptoVision | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
AptoVision | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
AptoVision | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 2,161
Cycleo |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 462 | 462
Cycleo | (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Cycleo | (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Cycleo | (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | $ 462 | $ 462

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