Reportable Segments (Details 2) - USD ($) $ in Millions		12 Months Ended
		Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Revenue from External Customer [Line Items]
Net sales		$ 8,002.7	$ 7,801.0	$ 7,838.0
Percent of product sales attributable to primary reportable segment		75.00%
U.S. Retail Coffee [Member]
Revenue from External Customer [Line Items]
Net sales		$ 2,374.6	2,149.5	2,122.3
U.S. Retail Coffee [Member] | Coffee [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	2,639.7	2,475.4	2,479.4
U.S. Retail Pet Foods [Member]
Revenue from External Customer [Line Items]
Net sales		2,844.5	2,869.5	2,879.5
U.S. Retail Pet Foods [Member] | Dog food [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	1,090.8	1,217.6	1,313.1
U.S. Retail Pet Foods [Member] | Cat food [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	918.4	869.2	812.8
U.S. Retail Pet Foods [Member] | Pet snacks [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	907.3	849.7	815.1
U.S. Retail Consumer Foods [Member]
Revenue from External Customer [Line Items]
Net sales		1,835.7	1,731.7	1,761.5
U.S. Retail Consumer Foods [Member] | Peanut butter [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	796.1	730.6	756.6
U.S. Retail Consumer Foods [Member] | Frozen handheld [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	430.3	365.0	289.0
U.S. Retail Consumer Foods [Member] | Fruit spreads [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	385.9	370.3	341.6
U.S. Retail Consumer Foods [Member] | Shortening and oils [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	193.9	262.3	253.6
U.S. Retail Consumer Foods [Member] | Juices and beverages [Member]
Revenue from External Customer [Line Items]
Net sales	[1]	139.0	125.7	123.9
Other
Revenue from External Customer [Line Items]
Net sales		947.9	1,050.3	1,074.7
Other | Portion control [Member]
Revenue from External Customer [Line Items]
Net sales	[1],[2]	120.5	153.3	162.7
Other | Baking mixes and ingredients [Member]
Revenue from External Customer [Line Items]
Net sales	[1],[2],[3]	93.5	89.9	185.2
Other | Other [Member]
Revenue from External Customer [Line Items]
Net sales	[1],[2]	$ 287.3	$ 292.0	$ 305.0

[1] The primary reportable segment generally represents at least 75 percent of total net sales for each respective product category.

[2] Represents the combined International and Away From Home operating segments.

[3] During 2019, the primary reportable segment was U.S. Retail Consumer Foods, as the majority of the net sales within this category were related to the divested U.S. baking business. For more information, see Note 4: Divestitures.