Employee Benefits - Employee Vacation Policy Changes (Details) $ in Millions	12 Months Ended
	Apr. 27, 2019 USD ($)
Employee Vacation Policy Changes
Non-cash gain due to change in employee vacation policy	$ 5.1
Cost of Sales
Employee Vacation Policy Changes
Non-cash gain due to change in employee vacation policy	1.3
Incremental expense due to change in employee vacation policy	$ 1.1