Divestitures (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)	Jan. 31, 2021 USD ($)	Jan. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Dec. 01, 2020 Position
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures - net			$ 569.3	$ 0.0
Gain (loss) on divestitures	$ 27.2	$ 0.0	27.2	$ 0.0
Crisco 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 | Position						160
Proceeds from divestitures - net			533.4
Gain (loss) on divestitures	114.9		114.9
Inventories	32.9		32.9
Property, plant, and equipment - net	37.2		37.2
Operating lease right-of-use assets	1.6		1.6
Goodwill	227.6		227.6
Other intangible assets - net	117.5		117.5
Other noncurrent assets	0.2		0.2
Total assets disposed	417.0		417.0
Current operating lease liabilities	0.6		0.6
Noncurrent operating lease liabilities	1.0		1.0
Deferred income taxes	0.0		0.0
Other noncurrent liabilities	0.0		0.0
Total liabilities disposed	1.6		1.6
Net assets disposed	415.4		415.4
Crisco Business [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					$ 270.0
Natural Balance Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestitures - net			35.9
Gain (loss) on divestitures	(87.7)		(87.7)
Inventories	18.2		18.2
Property, plant, and equipment - net	0.0		0.0
Operating lease right-of-use assets	0.1		0.1
Goodwill	74.1		74.1
Other intangible assets - net	41.3		41.3
Other noncurrent assets	0.0		0.0
Total assets disposed	133.7		133.7
Current operating lease liabilities	0.0		0.0
Noncurrent operating lease liabilities	0.0		0.0
Deferred income taxes	10.1		10.1
Other noncurrent liabilities	0.3		0.3
Total liabilities disposed	10.4		10.4
Net assets disposed	$ 123.3		$ 123.3
Natural Balance 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					$ 220.0