Integration and Restructuring Costs (Details) - Ainsworth [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Apr. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Cost Incurred to Date					$ 48.6
Restructuring and Related Cost, Noncash Charge Incurred to Date					4.7
Restructuring and Related Cost, Incurred Cost	$ 0.0	$ 3.3	$ 0.0	$ 6.6
Employee-related costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve					$ 0.5