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	Oct. 27, 2019	Jan. 27, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	$ 0	$ 69
Total financial assets	7,847	3,174
Derivative liabilities	39	0
Total financial liabilities	349	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 liabilities	0	0
Total financial liabilities	0	0
(Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	0	69
Total financial assets	0	69
Derivative liabilities	39	0
Total financial liabilities	39	0
(Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	0	0
Total financial assets	7,847	3,105
Derivative liabilities	0	0
Total financial liabilities	310	2,623
Convertible debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	7,847	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	7,847	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	310	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	$ 310	$ 462