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Revenue Recognition Contract with Customer, Asset and Liability (Details) $ in Thousands	12 Months Ended
	Apr. 27, 2019 USD ($) contract	Apr. 28, 2018 USD ($) contract
Revenue from Contract with Customer [Abstract]
Contract assets	$ 33,704	$ 30,968
Contract liabilities	47,178	39,379
Long-term contract liabilities	10,053	$ 7,475
Dollar Change [Abstract]
Contract assets	2,736
Contract liabilities - current	7,799
Contract liabilities - noncurrent	$ 2,578
Change in Contract with Customer, Asset and Liability, Percentage [Abstract]
Contract assets percent change	8.83%
Contract liabilities, current, percent change	19.80%
Contract liabilities, noncurrent, percent change	34.49%
Number of Loss on Contracts | contract	6	2
Provision for Loss on Contracts	$ 2,353	$ 30
Revenue recognized related to contract liability	$ 35,676

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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