Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021	Feb. 01, 2023
Goodwill and Intangible Assets [Line Items]
Amortization expense for finite-lived intangible assets	$ 205.9	$ 222.5	$ 232.0
Weighted-average useful life of the finite-lived intangible assets	24 years
Estimated amortization expense for 2024	$ 156.2
Estimated amortization expense for 2025	153.2
Estimated amortization expense for 2026	151.5
Estimated amortization expense for 2027	150.9
Estimated amortization expense for 2028	150.9
Other intangible assets impairment charges	0.0	150.4	3.8
Percentage of fair value in excess of carrying amount, reporting unit				10.00%
Pet Food Brands
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 790.3
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	17 years
Trademarks
Goodwill and Intangible Assets [Line Items]
Weighted-average useful life of the finite-lived intangible assets	14 years
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	10.00%			7.00%
U.S. Retail Pet Foods [Member] | Pet Food Brands
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 790.3
U.S. Retail Pet Foods [Member] | Trademarks
Goodwill and Intangible Assets [Line Items]
Other intangible assets impairment charges		$ 150.4