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Fair Value Measurement - Roll Forward of the Level 3 Contingent Consideration Liability (Details) - Estimate of Fair Value Measurement [Member] - Level 3 - Recurring Basis - Contingent Consideration Liability
$ in Thousands
9 Months Ended
Jan. 26, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Contingent liability as of April 28, 2018 $ 1,000
Additions 1,316
Fair value adjustments (1) (956)
Interest 9
Foreign currency translation (15)
Contingent liabilities as of January 26, 2019 1,354
Contingent consideration liabilities, high 1,354
Contingent consideration liabilities, low $ 0