Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
		Apr. 30, 2025	Jan. 31, 2025	Oct. 31, 2024	Apr. 30, 2025		Apr. 30, 2024	Apr. 30, 2023	Feb. 01, 2025
Goodwill and Intangible Assets [Line Items]
Amortization expense for finite-lived intangible assets					$ 218.3		$ 190.1	$ 205.9
Weighted-average useful life of the finite-lived intangible assets		24 years			24 years
Estimated amortization expense for Year One		$ 200.9			$ 200.9
Estimated amortization expense for Year Two		192.8			192.8
Estimated amortization expense for Year Three		193.1			193.1
Estimated amortization expense for Year Four		165.3			165.3
Estimated amortization expense for Year Five		138.2			138.2
Other intangible assets impairment charges		112.7	$ 208.2		320.9		0.0	0.0
Percentage of fair value in excess of carrying amount, reporting unit									10.00%
Asset Impairment Charges		980.0	1,000.0		1,982.5
Goodwill impairment charges		867.3	$ 794.3		1,661.6	[1]	0.0	0.0
Gain (loss) on divestitures - net					(310.1)		$ (12.9)	$ (1,018.5)
Voortman
Goodwill and Intangible Assets [Line Items]
Disposal Group, Including Discontinued Operation, Goodwill				$ 251.0
Gain (loss) on divestitures - net				$ 260.8
Voortman
Goodwill and Intangible Assets [Line Items]
Disposal Group, Including Discontinued Operation, Goodwill		$ 251.1			251.1
Gain (loss) on divestitures - net					$ (265.9)
Customer and contractual relationships
Goodwill and Intangible Assets [Line Items]
Weighted-average useful life of the finite-lived intangible assets		24 years			24 years
Patents and technology
Goodwill and Intangible Assets [Line Items]
Weighted-average useful life of the finite-lived intangible assets		20 years			20 years
Trademarks
Goodwill and Intangible Assets [Line Items]
Weighted-average useful life of the finite-lived intangible assets		14 years			14 years
U.S. Retail Pet Foods
Goodwill and Intangible Assets [Line Items]
Goodwill impairment charges	[1]				$ 0.0
Sweet Baked Snacks
Goodwill and Intangible Assets [Line Items]
Goodwill impairment charges	[1]				$ 1,661.6

[1] Included in goodwill as of April 30, 2025, are accumulated goodwill impairment charges of $1,904.5.