Divestitures - (Details Textual) shares in Millions, $ in Millions			12 Months Ended			15 Months Ended
	Nov. 15, 2023 USD ($) shares	Apr. 28, 2023 USD ($) numberOfEmployees shares	Apr. 30, 2024 USD ($)	Apr. 30, 2023 USD ($)	Apr. 30, 2022 USD ($)	Jul. 31, 2022 USD ($)	Nov. 01, 2023 numberOfEmployees	Jan. 31, 2022 numberOfEmployees	Dec. 01, 2021 numberOfEmployees
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures – net			$ 56.3	$ 686.3	$ 130.0
Gain (loss) on divestitures - net			(12.9)	(1,018.5)	9.6
Investment in equity securities			0.0	487.8
Canada Condiment Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures – net			25.3
Gain (loss) on divestitures - net			(5.7)
Canada Condiment Business | Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales			43.8	61.6	62.7
Sahale Snacks
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures – net			31.6
Gain (loss) on divestitures - net			(6.7)
Disposal Group, Not Discontinued Operation, Number of Employees | numberOfEmployees							100
Sahale Snacks | U.S. Retail Frozen Handheld and Spreads
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales			24.1	48.4	47.4
Pet Food Brands
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures – net			683.9
Gain (loss) on divestitures - net				(1,000.0)
Disposal Group, Not Discontinued Operation, Number of Employees | numberOfEmployees		1,100
Total proceeds from divestitures - cash and equity			$ 1,200.0
Pet Food Brands | Post Holdings Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures - equity | shares	5.4	5.4
Investment in equity securities	$ 460.9	$ 491.6		487.8
Proceeds from investment in equity securities	$ 466.3
Pet Food Brands | U.S. Retail Pet Foods
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales				1,500.0	1,400.0
Natural Beverage and Grains Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures – net						$ 98.7
Gain (loss) on divestitures - net				$ 1.6	26.7	$ 28.3
Disposal Group, Not Discontinued Operation, Number of Employees | numberOfEmployees								150
Natural Beverage and Grains Businesses | U.S. Retail Frozen Handheld and Spreads
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales					106.7
Private Label Dry Pet Food Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures – net					32.9
Gain (loss) on divestitures - net					(17.1)
Disposal Group, Not Discontinued Operation, Number of Employees | numberOfEmployees									220
Private Label Dry Pet Food Business | U.S. Retail Pet Foods
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales					$ 62.3