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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 27, 2019 | Aug. 17, 2018 | Jan. 28, 2018 | Jul. 01, 2017
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 351,141 |  | $ 341,897 |
TrackNet |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset |  | $ 3,000 |  |
Goodwill | 4,316 | $ 4,300 |  |
Other assets (liabilities), net | 1,184 |  |  |
Total consideration | 8,500 |  |  |
AptoVision |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Indefinite-lived intangible asset - IPR&D | 2,300 |  |  |
Goodwill | 12,194 |  |  | $ 12,200
Other (liabilities) assets, net | (3,875) |  |  |
Total consideration | $ 34,619 |  |  |
Core technologies | TrackNet |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life | 3 years |  |  |
Finite-lived intangible asset | $ 3,000 |  |  |
Developed technology | AptoVision |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible asset | $ 20,000 |  |  |
Customer relationships | AptoVision |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life | 3 years |  |  |
Finite-lived intangible asset | $ 4,000 |  |  |
Minimum | Developed technology | AptoVision |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life | 6 years |  |  |
Maximum | Developed technology | AptoVision |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful life | 7 years |  |  |

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