Integration and Restructuring Costs (Details) - Ainsworth [Member] - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost	$ 16.5	$ 32.1
Total costs incurred to date	48.6
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost	2.4	15.5
Total costs incurred to date	17.9
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost	14.1	$ 16.6
Total costs incurred to date	$ 30.7