Goodwill and Other Intangible Assets (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
Summary of changes in the company's goodwill
Goodwill, Beginning Balance				$ 7,649.9		$ 5,216.9
Acquisition						2,447.2
Goodwill impairment charge		$ (867.3)	$ (794.3)	(1,661.6)	[1]	0.0	$ 0.0
Divestitures				(277.7)		(11.5)
Other	[2]			(0.6)	[3]	(2.7)
Goodwill, Ending Balance		5,710.0		5,710.0		7,649.9	5,216.9
Goodwill, Impaired, Accumulated Impairment Loss		1,904.5		1,904.5
U.S. Retail Coffee
Summary of changes in the company's goodwill
Goodwill, Beginning Balance				2,090.9		2,090.9
Acquisition						0.0
Goodwill impairment charge	[1]			0.0
Divestitures				0.0		0.0
Other	[2]			0.0	[3]	0.0
Goodwill, Ending Balance		2,090.9		2,090.9		2,090.9	2,090.9
U.S. Retail Frozen Handheld and Spreads
Summary of changes in the company's goodwill
Goodwill, Beginning Balance				1,139.9		1,147.5
Acquisition						0.0
Goodwill impairment charge	[1]			0.0
Divestitures				0.0		(7.6)
Other	[2]			0.0	[3]	0.0
Goodwill, Ending Balance		1,139.9		1,139.9		1,139.9	1,147.5
U.S. Retail Pet Foods
Summary of changes in the company's goodwill
Goodwill, Beginning Balance				1,580.2		1,580.2
Acquisition						0.0
Goodwill impairment charge	[1]			0.0
Divestitures				0.0		0.0
Other	[2]			0.0	[3]	0.0
Goodwill, Ending Balance		1,580.2		1,580.2		1,580.2	1,580.2
Sweet Baked Snacks
Summary of changes in the company's goodwill
Goodwill, Beginning Balance				2,447.2		0.0
Acquisition						2,447.2
Goodwill impairment charge	[1]			(1,661.6)
Divestitures				(277.7)		0.0
Other	[2]			(0.4)	[3]	0.0
Goodwill, Ending Balance		507.5		507.5		2,447.2	0.0
International and Away From Home
Summary of changes in the company's goodwill
Goodwill, Beginning Balance				391.7		398.3
Acquisition						0.0
Goodwill impairment charge	[1]			0.0
Divestitures				0.0		(3.9)
Other	[2]			(0.2)	[3]	(2.7)
Goodwill, Ending Balance		$ 391.5		$ 391.5		$ 391.7	$ 398.3

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

[2] The amount classified as other in the International and Away From Home segment represents foreign currency translation adjustments.

[3] The amount classified as other in the Sweet Baked Snacks segment represents purchase accounting adjustments for the acquisition of Hostess Brands.