Goodwill and Other Intangible Assets - Narrative (Details) $ in Millions		12 Months Ended
	Feb. 01, 2022 reporting_unit	Apr. 30, 2022 USD ($)		Apr. 30, 2021 USD ($)	Apr. 30, 2020 USD ($)
Goodwill and Intangible Assets [Line Items]
Amortization expense for finite-lived intangible assets		$ 222.5		$ 232.0	$ 235.3
Weighted-average useful life of the finite-lived intangible assets		23 years
Estimated amortization expense for 2023		$ 222.5
Estimated amortization expense for 2024		218.4
Estimated amortization expense for 2025		215.3
Estimated amortization expense for 2026		213.6
Estimated amortization expense for 2027		213.0
Other intangible assets impairment charges		150.4		3.8	52.4
Number of reporting units | reporting_unit	6
Goodwill		$ 6,015.8	[1]	6,023.6	6,304.5
Customer and contractual relationships
Goodwill and Intangible Assets [Line Items]
Weighted-average useful life of the finite-lived intangible assets		24 years
Patents and technology
Goodwill and Intangible Assets [Line Items]
Weighted-average useful life of the finite-lived intangible assets		16 years
Trademarks
Goodwill and Intangible Assets [Line Items]
Weighted-average useful life of the finite-lived intangible assets		15 years
U.S. Retail Consumer Foods [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill		$ 1,147.5		1,147.5	1,358.2
U.S. Retail Consumer Foods [Member] | Trademarks
Goodwill and Intangible Assets [Line Items]
Other intangible assets impairment charges				3.8
U.S. Retail Pet Foods [Member]
Goodwill and Intangible Assets [Line Items]
Percentage of fair value in excess of carrying amount, reporting unit	6.00%
Goodwill		2,368.2		$ 2,368.2	2,442.3
U.S. Retail Pet Foods [Member] | Trademarks
Goodwill and Intangible Assets [Line Items]
Other intangible assets impairment charges		$ 150.4			$ 52.4

[1] Included in goodwill as of April 30, 2022, are accumulated goodwill impairment charges of $242.9.