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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 [Member] - USD ($) $ in Thousands | Jul. 29, 2018 | Jan. 28, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total financial assets | $ 2,605 | $ 1,960
Derivative financial instruments | 126 | 0
Total financial liabilities | 20,894 | 21,668
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total financial assets | 0 | 0
Derivative financial instruments | 0 | 0
Total financial liabilities | 0 | 0
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total financial assets | 0 | 0
Derivative financial instruments | 126 | 0
Total financial liabilities | 126 | 0
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total financial assets | 2,605 | 1,960
Derivative financial instruments | 0 | 0
Total financial liabilities | 20,768 | 21,668
Convertible debt |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 2,605 | 1,960
Convertible debt | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Convertible debt | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Convertible debt | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 2,605 | 1,960
AptoVision Technologies Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 20,100 | 21,000
AptoVision Technologies Inc. | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
AptoVision Technologies Inc. | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
AptoVision Technologies Inc. | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 20,100 | 21,000
Cycleo |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 668 | 668
Cycleo | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Cycleo | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Cycleo | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | $ 668 | $ 668

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