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Acquisition (Details Textual) - USD ($)
May 14, 2018
Jan. 31, 2020
Apr. 30, 2019
Acquisition [Line Items]      
Debt instrument face amount   $ 5,100,000,000.0 $ 5,500,000,000.0
Goodwill   6,312,800,000 6,310,900,000
Ainsworth [Member]      
Acquisition [Line Items]      
Payments to Acquire Businesses, Gross $ 1,900,000,000    
Commercial Paper 400,000,000.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 1,300,000,000    
Business Acquisition, Goodwill, Expected Tax Deductible Amount 446,000,000.0 392,900,000  
Term Loan Credit Agreement due May 14, 2021      
Acquisition [Line Items]      
Debt instrument face amount 1,500,000,000 700,000,000.0 $ 800,000,000.0
Term Loan Credit Agreement due May 14, 2021 | Ainsworth [Member]      
Acquisition [Line Items]      
Debt instrument face amount 1,500,000,000    
U.S. Retail Pet Foods [Member]      
Acquisition [Line Items]      
Goodwill   $ 2,400,000,000  
U.S. Retail Pet Foods [Member] | Ainsworth [Member]      
Acquisition [Line Items]      
Goodwill $ 617,800,000