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Fair Value Measurements - Financial Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Apr. 29, 2018 | Jan. 28, 2018
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Agency Securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | $ 30,004 | $ 0
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative financial instruments (asset) | 64 | 0
Total financial assets | 32,564 | 1,960
Total financial liabilities | 21,668 | 21,668
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative financial instruments (asset) | 0 | 0
Total financial assets | 30,000 | 0
Total financial liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative financial instruments (asset) | 64 | 0
Total financial assets | 64 | 0
Total financial liabilities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative financial instruments (asset) | 0 | 0
Total financial assets | 2,500 | 1,960
Total financial liabilities | 21,668 | 21,668
Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 30,000 | 0
Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 30,000 | 0
Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Convertible debt |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 2,500 | 1,960
Fair Value, Measurements, Recurring [Member] | Convertible debt | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Convertible debt | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Convertible debt | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 2,500 | 1,960
Fair Value, Measurements, Recurring [Member] | AptoVision Technologies Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 21,000 | 21,000
Fair Value, Measurements, Recurring [Member] | AptoVision Technologies Inc. | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | AptoVision Technologies Inc. | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | AptoVision Technologies Inc. | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 21,000 | 21,000
Fair Value, Measurements, Recurring [Member] | Cycleo |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 668 | 668
Fair Value, Measurements, Recurring [Member] | Cycleo | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | Cycleo | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | Cycleo | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | $ 668 | $ 668

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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