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Fair Value Measurements - Reconciliation of the Earn-out Liability (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 26, 2020 | Jul. 28, 2019 | Jul. 26, 2020 | Jul. 28, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance |  |  | $ 2,108 |
Changes in the fair value of contingent earn-out obligations | $ 0 | $ 0 | (33) | $ (2,161)
Ending balance | $ 1,958 |  | 1,958 |
Non-Contingent Obligation |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Changes in the fair value |  |  | $ (117) |

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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