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Integration and Restructuring Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Apr. 30, 2019
Organization Optimization Program [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Cost Incurred to Date         $ 74.6
Restructuring and Related Cost, Incurred Cost $ 0.0 $ 11.1 $ 0.0 $ 28.0  
Restructuring and Related Cost, Noncash Charge Incurred to Date         15.2
Restructuring and Related Cost, Incurred Noncash Charge   1.2   2.2  
Organization Optimization Program [Member] | Employee-related costs [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Cost Incurred to Date         48.7
Restructuring Reserve         0.8
Organization Optimization Program [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Cost Incurred to Date         25.9
Ainsworth [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 50.0   50.0    
Restructuring and Related Cost, Cost Incurred to Date 42.0   42.0    
Restructuring and Related Cost, Incurred Cost 3.3 7.7 9.9 23.9  
Restructuring and Related Cost, Noncash Charge Incurred to Date 4.6   4.6    
Restructuring and Related Cost, Incurred Noncash Charge 0.1 1.0 0.5 2.8  
Ainsworth [Member] | Employee-related costs [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Cost Incurred to Date 17.2   17.2    
Restructuring and Related Cost, Incurred Cost 0.3 5.4 1.7 13.2  
Restructuring Reserve 0.3   0.3   $ 1.6
Ainsworth [Member] | Other Restructuring [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Cost Incurred to Date 24.8   24.8    
Restructuring and Related Cost, Incurred Cost $ 3.0 $ 2.3 $ 8.2 $ 10.7