Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Apr. 30, 2025	Jan. 31, 2025	Apr. 30, 2025		Apr. 30, 2024		Apr. 30, 2023
Segment Reporting Information [Line Items]
Net sales				$ 8,726.1		$ 8,178.7		$ 8,529.2
Cost of products sold	[1]			5,341.4		5,063.3		5,727.4
Selling, General and Administrative Expense				1,529.0		1,446.2		1,455.0
Segment profit				2,147.2		1,941.7		1,728.5
Amortization				(219.3)		(191.1)		(206.9)
Goodwill impairment charges		$ 867.3	$ 794.3	1,661.6	[2]	0.0		0.0
Other intangible assets impairment charges		(112.7)	$ (208.2)	(320.9)		0.0		0.0
Gain (loss) on divestitures - net				(310.1)		(12.9)		(1,018.5)
Interest expense – net				(388.7)		(264.3)		(152.0)
Change in net cumulative unallocated derivative gains and losses				58.2		6.7		(21.4)
Cost of products sold – special project costs (B)	[3]			(9.1)		(2.9)		(6.4)
Other special project costs (A)	[1],[3]			(35.8)		(130.2)		(4.7)
Other debt gains (charges) – net	[1]			30.2	[3]	(19.5)	[3]	0.0
Corporate administrative expenses				(322.5)		(305.5)		(313.1)
Other income (expense) – net	[3]			(14.4)		(25.6)		(14.7)
Income (Loss) Before Income Taxes				(1,046.8)		996.4		(9.2)
Assets		17,563.3		17,563.3		20,273.7		14,991.4
Depreciation, amortization, and impairment charges				2,485.0		430.8		431.0
Additions to property, plant, and equipment				393.8		586.5		477.4
Unallocated
Segment Reporting Information [Line Items]
Assets	[4]	261.1		261.1		149.5		1,237.2
Depreciation, amortization, and impairment charges	[5]			45.6		38.0		42.7
U.S. Retail Coffee
Segment Reporting Information [Line Items]
Goodwill impairment charges	[2]			0.0
U.S. Retail Coffee | Operating Segments
Segment Reporting Information [Line Items]
Net sales				2,806.6		2,704.4		2,735.3
Cost of products sold	[6]			1,709.3		1,572.8		1,680.4
Selling, General and Administrative Expense	[7]			308.4		330.1		315.6
Segment Reporting, Other Segment Item, Amount	[8]			(6.2)		42.3		1.6
Segment profit				795.1		759.2		737.7
Assets		4,927.8		4,927.8		4,826.3		4,808.9
Depreciation, amortization, and impairment charges				97.9		101.1		101.6
Additions to property, plant, and equipment by segment				62.7		79.7		49.0
U.S. Retail Frozen Handheld and Spreads
Segment Reporting Information [Line Items]
Goodwill impairment charges	[2]			0.0
U.S. Retail Frozen Handheld and Spreads | Operating Segments
Segment Reporting Information [Line Items]
Net sales				1,877.0		1,815.6		1,630.9
Cost of products sold	[6]			1,167.5		1,118.8		1,078.1
Selling, General and Administrative Expense	[7]			276.7		261.8		217.1
Segment Reporting, Other Segment Item, Amount	[8]			7.5		0.9		(16.9)
Segment profit				425.3		434.1		352.6
Assets		3,263.1		3,263.1		3,257.1		2,972.7
Depreciation, amortization, and impairment charges				90.8		81.6		76.3
Additions to property, plant, and equipment by segment				157.6		334.5		341.6
U.S. Retail Pet Foods
Segment Reporting Information [Line Items]
Goodwill impairment charges	[2]			0.0
U.S. Retail Pet Foods | Operating Segments
Segment Reporting Information [Line Items]
Net sales				1,663.6		1,822.8		3,038.1	[9]
Cost of products sold	[6]			936.0		1,131.7		2,100.8	[9]
Selling, General and Administrative Expense	[7]			281.5		296.7		457.1	[9]
Segment Reporting, Other Segment Item, Amount	[8]			(13.5)		(7.7)		(14.7)	[9]
Segment profit				459.6		402.1		494.9	[9]
Assets		4,679.3		4,679.3		4,784.1		4,994.3
Depreciation, amortization, and impairment charges				121.3		118.1		178.7
Additions to property, plant, and equipment by segment				83.2		83.4		64.3
Sweet Baked Snacks
Segment Reporting Information [Line Items]
Goodwill impairment charges	[2]			1,661.6
Sweet Baked Snacks | Operating Segments
Segment Reporting Information [Line Items]
Net sales				1,178.8		637.3		0.0
Cost of products sold	[6]			779.9		410.0		0.0
Selling, General and Administrative Expense	[7]			181.8		89.9		0.0
Segment Reporting, Other Segment Item, Amount	[8]			(2.7)		(0.8)		0.0
Segment profit				219.8		138.2		0.0
Assets		3,394.9		3,394.9		6,267.1		0.0
Depreciation, amortization, and impairment charges	[10]			2,092.0		59.6		0.0
Additions to property, plant, and equipment by segment				43.0		41.2		0.0
International and Away From Home
Segment Reporting Information [Line Items]
Goodwill impairment charges	[2]			0.0
International and Away From Home | Operating Segments
Segment Reporting Information [Line Items]
Net sales				1,200.1		1,198.6		1,124.9
Cost of products sold	[6]			797.8		833.8		840.3
Selling, General and Administrative Expense	[7]			158.1		158.3		146.9
Segment Reporting, Other Segment Item, Amount	[8]			(3.2)		(1.6)		(5.6)
Segment profit				247.4		208.1		143.3
Assets		$ 1,037.1		1,037.1		989.6		978.3
Depreciation, amortization, and impairment charges				37.4		32.4		31.7
Additions to property, plant, and equipment by segment				$ 47.3		$ 47.7		$ 22.5

[1] Includes special project costs related to certain divestiture, acquisition, integration, and restructuring activities. For more information, see Note 4: Special Project Costs, Note 5: Reportable Segments, and Note 8: Debt and Financing Arrangements.

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

[3] Includes special project costs related to certain divestiture, acquisition, integration, and restructuring activities. For more information, see Note 4: Special Project Costs and Note 8: Debt and Financing Arrangements.

[4] Primarily represents unallocated cash and cash equivalents and corporate-held investments.

[5] Primarily represents unallocated corporate administrative expenses, mainly consisting of depreciation and software amortization.

[6] Segment cost of products sold excludes special project costs related to certain divestiture, acquisition, integration, and restructuring activities and the change in net cumulative unallocated derivative gains and losses. For more information, see Note 4: Special Project Costs and Note 10: Derivative Financial Instruments.

[7] Segment selling and distribution expense excludes corporate administrative expenses and special project costs that are not allocated to the segments.

[8] Other segment items primarily reflects the loss (gain) on disposal of assets, plant administrative expenses, equity method investment income, and royalty income. In 2024, the U.S. Retail Coffee segment includes an unfavorable impact related to the termination of a supplier agreement. In 2023, the U.S. Frozen Handheld and Spreads segment includes a favorable impact related to the Jif peanut butter recall.

[9] On April 28, 2023, we sold certain pet food brands to Post, and the divested net sales were primarily included in the U.S. Retail Pet Foods segment. For more information, see Note 3: Divestitures.

[10] During 2025, we recognized pre-tax impairment charges of $1,661.6 and $320.9 related to the goodwill of the Sweet Baked Snacks reporting unit and Hostess brand indefinite-lived trademark, respectively. For more information, see Note 7: Goodwill and Other Intangible Assets.