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Commitments and Contingencies - Summary of Earn-out Liability (Details) - USD ($) $ in Thousands | Jan. 27, 2019 | Jan. 28, 2018
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Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | $ 6,675 | $ 26,520
Earn-out liability expected to be settled within twelve months | 3,276 |
Cycleo |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 4,514 | 5,520
Earn-out liability expected to be settled within twelve months | 1,978 |
AptoVision |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 2,161 | 21,000
Earn-out liability expected to be settled within twelve months | 1,298 |
Compensation Expense [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 4,052 | 4,408
Compensation Expense [Member] | Cycleo |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 4,052 | 4,408
Compensation Expense [Member] | AptoVision |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 0 | 0
Not Conditional Upon Future Employment [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 2,623 | 21,668
Not Conditional Upon Future Employment [Member] | Cycleo |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 462 | 668
Not Conditional Upon Future Employment [Member] | AptoVision |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 2,161 | 21,000
Interest Expense [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 0 | 444
Interest Expense [Member] | Cycleo |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | 0 | 444
Interest Expense [Member] | AptoVision |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Earn-out liability | $ 0 | $ 0

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