Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Net sales:
Net sales		$ 2,050.0	$ 2,034.0	$ 3,908.0	$ 4,005.8
Segment profit:
Segment profit		458.8	501.8	841.6	972.1
Amortization		(55.4)	(59.5)	(110.8)	(119.1)
Interest expense – net		(40.3)	(45.1)	(83.4)	(91.2)
Change in net cumulative unallocated derivative gains and losses		(13.3)	31.5	(15.5)	47.7
Costs of products sold - special project costs (A)	[1]	(6.1)	0.0	(10.7)	0.0
Other special project costs (A)	[1],[2]	(1.3)	0.0	(3.1)	0.0
Corporate administrative expenses		(70.9)	(93.0)	(130.3)	(158.8)
Other income (expense) – net		(2.7)	(32.2)	(13.8)	(33.6)
Income Before Income Taxes		268.8	303.5	474.0	617.1
U.S. Retail Pet Foods [Member]
Net sales:
Net sales		701.6	708.7	1,349.6	1,401.3
Segment profit:
Segment profit		99.6	124.9	179.5	250.2
U.S. Retail Coffee [Member]
Net sales:
Net sales		645.1	594.7	1,188.3	1,165.6
Segment profit:
Segment profit		207.8	202.1	359.1	384.7
U.S. Retail Consumer Foods [Member]
Net sales:
Net sales		441.2	479.1	876.8	968.3
Segment profit:
Segment profit		111.0	135.3	229.7	266.8
International and Away From Home
Net sales:
Net sales		262.1	251.5	493.3	470.6
Segment profit:
Segment profit		$ 40.4	$ 39.5	$ 73.3	$ 70.4

[1] Special project costs include divestiture, acquisition, integration, and restructuring costs, which are recognized in cost of products sold and other special project costs in the Condensed Statements of Consolidated Income. For more information, see Note 3: Integration and Restructuring Costs.

[2] Special project costs include divestiture, acquisition, integration, and restructuring costs, which are recognized in cost of products sold and other special project costs. For more information, see Note 3: Integration and Restructuring Costs and Note 5: Reportable Segments.