Reportable Segments (Details 2) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Product category information [Line Items]
Net sales		$ 2,034.0	$ 1,957.8	$ 4,005.8	$ 3,736.7
Percent of product sales attributable to primary reportable segment				75.00%
U.S. Retail Coffee [Member]
Product category information [Line Items]
Net sales		594.7	543.4	$ 1,165.6	1,009.1
U.S. Retail Coffee [Member] | Coffee [Member]
Product category information [Line Items]
Net sales	[1]	659.6	627.1	1,295.3	1,173.8
U.S. Retail Pet Foods [Member]
Product category information [Line Items]
Net sales		708.7	709.9	1,401.3	1,379.8
U.S. Retail Pet Foods [Member] | Dog food [Member]
Product category information [Line Items]
Net sales	[1]	277.8	302.6	555.5	598.2
U.S. Retail Pet Foods [Member] | Cat food [Member]
Product category information [Line Items]
Net sales	[1]	231.9	213.8	451.9	409.7
U.S. Retail Pet Foods [Member] | Pet snacks [Member]
Product category information [Line Items]
Net sales	[1]	216.7	210.0	429.5	403.2
U.S. Retail Consumer Foods [Member]
Product category information [Line Items]
Net sales		479.1	426.1	968.3	828.3
U.S. Retail Consumer Foods [Member] | Peanut butter [Member]
Product category information [Line Items]
Net sales	[1]	192.8	175.4	392.7	353.3
U.S. Retail Consumer Foods [Member] | Frozen handheld [Member]
Product category information [Line Items]
Net sales	[1]	106.3	93.4	201.8	164.9
U.S. Retail Consumer Foods [Member] | Fruit spreads [Member]
Product category information [Line Items]
Net sales	[1]	89.2	86.5	193.5	175.7
U.S. Retail Consumer Foods [Member] | Shortening and oils [Member]
Product category information [Line Items]
Net sales	[1]	82.7	71.8	160.0	123.3
U.S. Retail Consumer Foods [Member] | Juices and beverages [Member]
Product category information [Line Items]
Net sales	[1]	36.7	32.4	70.3	63.6
Other
Product category information [Line Items]
Net sales		251.5	278.4	470.6	519.5
Other | Portion control [Member]
Product category information [Line Items]
Net sales	[1],[2]	31.1	42.5	55.1	81.9
Other | Baking mixes and ingredients [Member]
Product category information [Line Items]
Net sales	[1],[2]	30.0	26.0	53.2	39.7
Other | Other [Member]
Product category information [Line Items]
Net sales	[1],[2]	$ 79.2	$ 76.3	$ 147.0	$ 149.4

[1] The identified 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.