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Fair Value Measurement -Narrative (Details) - Recurring Basis - USD ($) $ in Thousands	Apr. 27, 2019	Apr. 28, 2018
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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Sensitivity Analysis of Fair Value, Fair Value, Net Asset (Liability), Impact of Change in Assumption

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Amount of liability recognized arising from contingent consideration in a business combination.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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