Revenue Recognition Contract with Customer, Asset and Liability (Details) $ in Thousands	12 Months Ended
	May 02, 2020 USD ($) contract	Apr. 27, 2019 USD ($) contract
Revenue from Contract with Customer [Abstract]
Contract assets	$ 35,467	$ 33,704
Contract liabilities	50,897	47,178
Long-term contract liabilities	10,707	$ 10,053
Dollar Change [Abstract]
Contract assets	1,763
Contract liabilities - current	3,719
Contract liabilities - noncurrent	$ 654
Change in Contract with Customer, Asset and Liability, Percentage [Abstract]
Contract assets percent change	5.23%
Contract liabilities, current, percent change	7.88%
Contract liabilities, noncurrent, percent change	6.51%
Number of Loss on Contracts | contract	1	6
Provision for Loss on Contracts	$ 42	$ 2,353
Revenue recognized related to contract liability	$ 45,195