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Integration and Restructuring Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Organization Optimization Program [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost $ 32.0 $ 22.7 $ 18.6
Restructuring and Related Cost, Cost Incurred to Date 74.6    
Organization Optimization Program [Member] | Employee Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost 24.9 10.1 12.4
Restructuring and Related Cost, Cost Incurred to Date 48.7    
Organization Optimization Program [Member] | Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost 7.1 $ 12.6 $ 6.2
Restructuring and Related Cost, Cost Incurred to Date 25.9    
Ainsworth [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost 32.1    
Restructuring and Related Cost, Cost Incurred to Date 32.1    
Ainsworth [Member] | Employee Severance [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost 15.5    
Restructuring and Related Cost, Cost Incurred to Date 15.5    
Ainsworth [Member] | Other Restructuring [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost 16.6    
Restructuring and Related Cost, Cost Incurred to Date $ 16.6