Employee Benefits - Deferred Compensation (Details) - USD ($) $ in Millions	12 Months Ended
Apr. 27, 2019	Apr. 28, 2018
401(k)
Retirement and Welfare
Employer contributions	$ 1.7
PCRP \| Maximum
Retirement and Welfare
Period of benefit payments	20 years
PCRP \| Minimum
Retirement and Welfare
Period of benefit payments	5 years
PCRP \| Other current liabilities
Retirement and Welfare
Deferred compensation arrangement obligations	$ 0.5	$ 0.2
PCRP \| Other long-term liabilities
Retirement and Welfare
Deferred compensation arrangement obligations	12.0	9.5
Executive deferred compensation plan \| Other long-term liabilities
Retirement and Welfare
Deferred compensation arrangement obligations	23.9	23.2
Executive deferred compensation plan \| Other current assets
Retirement and Welfare
Market value of mutual funds	0.2
Executive deferred compensation plan \| Other current assets \| Maximum
Retirement and Welfare
Market value of mutual funds		0.1
Executive deferred compensation plan and PCRP \| Other long-term assets
Retirement and Welfare
Cash surrender value of life insurance contracts	$ 34.3	$ 31.6

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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