Divestitures - Narrative (Details) shares in Millions, $ in Millions		12 Months Ended			15 Months Ended
	Apr. 28, 2023 USD ($) numberOfEmployees shares	Apr. 30, 2023 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)	Jul. 31, 2022 USD ($)	Jan. 31, 2022 numberOfEmployees	Dec. 01, 2021 numberOfEmployees	Dec. 01, 2020 numberOfEmployees
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures - net		$ 686.3	$ 130.0	$ 564.0
Gain (loss) on divestitures - net		(1,018.5)	9.6	25.3
Investment in equity securities		487.8	0.0
Pet Food Brands
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Number of Employees | numberOfEmployees	1,100
Total proceeds from divestitures - cash and equity	$ 1,200.0
Proceeds from divestitures - net	$ 684.7
Gain (loss) on divestitures - net		(1,000.0)
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
Investment in equity securities	$ 491.6	487.8
Pet Food Brands | U.S. Retail Pet Foods [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales		1,500.0	1,400.0	1,400.0
Natural Beverage and Grains Businesses [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Number of Employees | numberOfEmployees						150
Proceeds from divestitures - net					$ 98.7
Gain (loss) on divestitures - net		$ 1.6	26.7		$ 28.3
Natural Beverage and Grains Businesses [Member] | U.S. Retail Consumer Foods [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales			106.7	143.4
Private Label Dry Pet Food Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Number of Employees | numberOfEmployees							220
Proceeds from divestitures - net			32.9
Gain (loss) on divestitures - net			(17.1)
Private Label Dry Pet Food Business [Member] | U.S. Retail Pet Foods [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales			$ 62.3	94.0
Natural Balance Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures - net				33.8
Gain (loss) on divestitures - net				(89.5)
Natural Balance Business | U.S. Retail Pet Foods [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales				156.7
Crisco Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Not Discontinued Operation, Number of Employees | numberOfEmployees								160
Proceeds from divestitures - net				530.2
Gain (loss) on divestitures - net				114.8
Crisco Business | U.S. Retail Consumer Foods [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Annual net sales				$ 198.9