Reportable Segments (Details 2) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Revenue from External Customer [Line Items]
Net sales		$ 2,092.0	$ 1,972.3	$ 1,957.8	$ 1,778.9	$ 1,902.1	$ 2,011.9	$ 2,021.5	$ 1,902.5	$ 7,801.0	$ 7,838.0	$ 7,357.1
Percent of product sales attributable to primary reportable segment										75.00%
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales										$ 7,801.0	7,838.0	7,357.1
U.S. Retail Coffee [Member] | Coffee [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									2,475.4	2,479.4	2,469.7
U.S. Retail Coffee [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales										2,149.5	2,122.3	2,086.8
U.S. Retail Pet Foods [Member] | Dog food [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									1,217.6	1,313.1	756.8
U.S. Retail Pet Foods [Member] | Cat food [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									869.2	812.8	702.5
U.S. Retail Pet Foods [Member] | Pet snacks [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									849.7	815.1	767.2
U.S. Retail Pet Foods [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales										2,869.5	2,879.5	2,165.3
U.S. Retail Consumer Foods [Member] | Peanut butter [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									730.6	756.6	745.1
U.S. Retail Consumer Foods [Member] | Fruit spreads [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									370.3	341.6	353.8
U.S. Retail Consumer Foods [Member] | Frozen handheld [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									365.0	289.0	254.1
U.S. Retail Consumer Foods [Member] | Shortening and oils [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									262.3	253.6	258.1
U.S. Retail Consumer Foods [Member] | Juices and beverages [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									125.7	123.9	140.8
U.S. Retail Consumer Foods [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales										1,731.7	1,761.5	1,985.6
International and Away From Home [Member] | Portion control [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									153.3	162.7	160.3
International and Away From Home [Member] | Baking mixes and ingredients [Member]
Revenue from External Customer [Line Items]
Net sales	[1],[2]									89.9	185.2	437.9
International and Away From Home [Member] | Other [Member]
Revenue from External Customer [Line Items]
Net sales	[1]									292.0	305.0	310.8
International and Away From Home [Member] | Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales										$ 1,050.3	$ 1,074.7	$ 1,119.4

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

[2] During 2019 and 2018, 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: Divestiture.