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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 | Oct. 29, 2017 | Jan. 29, 2017
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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 | $ 10,126 | $ 16,945
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative financial instruments (asset) | 482 | 326
Total financial assets | 10,608 | 18,696
Derivative financial instruments (liability) | 0 | 0
Total financial liabilities | 17,964 | 1,242
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 | 10,126 | 16,945
Derivative financial instruments (liability) | 0 | 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) | 482 | 326
Total financial assets | 482 | 326
Derivative financial instruments (liability) | 0 | 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 | 0 | 1,425
Derivative financial instruments (liability) | 0 | 0
Total financial liabilities | 17,964 | 1,242
Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Available-for-sale securities | 10,126 | 16,945
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 | 10,126 | 16,945
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 | 0 | 1,425
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 | 0 | 1,425
Fair Value, Measurements, Recurring [Member] | AptoVision Technologies Inc. [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 17,188 | 0
Fair Value, Measurements, Recurring [Member] | AptoVision Technologies Inc. [Member] | 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. [Member] | 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. [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 17,188 | 0
Fair Value, Measurements, Recurring [Member] | Triune Systems [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | Triune Systems [Member] | Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | Triune Systems [Member] | Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | Triune Systems [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 0 | 0
Fair Value, Measurements, Recurring [Member] | Cycleo [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | 776 | 1,242
Fair Value, Measurements, Recurring [Member] | Cycleo [Member] | 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 [Member] | 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 [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Earn-out liability | $ 776 | $ 1,242

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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=65884222&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=73527792&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=66010992&loc=d3e26610-111562 + Details
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