Acquisition (Details Textual) - USD ($)	May 14, 2018	Oct. 31, 2019	Apr. 30, 2019
Acquisition [Line Items]
Debt instrument face amount		$ 5,400,000,000.0	$ 5,500,000,000.0
Goodwill		6,313,600,000	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	400,700,000
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
Indefinite-lived intangible assets		$ 1,500,000,000
U.S. Retail Pet Foods [Member] | Ainsworth [Member]
Acquisition [Line Items]
Goodwill	$ 617,800,000