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Fair Value Measurement -Narrative (Details) - Recurring Basis - USD ($) $ in Thousands | Apr. 27, 2019 | Apr. 28, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets (Liability), net | $ 59,108 | $ 63,082
Estimate of Fair Value Measurement | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Business Combination, Contingent Consideration, Liability | 3,065 | 1,000
Assets (Liability), net | (3,065) | $ (1,000)
Sensitivity analysis of fair value, fair value, net asset (liability), impact of change in assumption | $ 0 |

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