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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
6 Months Ended
Oct. 27, 2018
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 (7)
Foreign currency translation (15)
Contingent liabilities as of October 27, 2018 1,338
Contingent consideration liabilities, high 1,338
Contingent consideration liabilities, low $ 0