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	Oct. 28, 2018	Jan. 28, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total financial assets	$ 3,105	$ 1,960
Derivative financial instruments	120	0
Total financial liabilities	2,743	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	120	0
Total financial liabilities	120	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total financial assets	3,105	1,960
Derivative financial instruments	0	0
Total financial liabilities	2,623	21,668
Convertible debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale securities	3,105	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	3,105	1,960
AptoVision Technologies Inc.
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	2,161	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	2,161	21,000
Cycleo
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Earn-out liability	462	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	$ 462	$ 668