Reportable Segments (Details 2) - USD ($) $ in Millions		3 Months Ended
		Jul. 31, 2020	Jul. 31, 2019
Product category information [Line Items]
Net sales		$ 1,971.8	$ 1,778.9
Percent of product sales attributable to primary reportable segment		75.00%
U.S. Retail Pet Foods [Member]
Product category information [Line Items]
Net sales		$ 692.6	669.9
U.S. Retail Pet Foods [Member] | Dog food [Member]
Product category information [Line Items]
Net sales	[1]	277.7	295.6
U.S. Retail Pet Foods [Member] | Cat food [Member]
Product category information [Line Items]
Net sales	[1]	220.0	195.9
U.S. Retail Pet Foods [Member] | Pet snacks [Member]
Product category information [Line Items]
Net sales	[1]	212.8	193.2
U.S. Retail Coffee [Member]
Product category information [Line Items]
Net sales		570.9	465.7
U.S. Retail Coffee [Member] | Coffee [Member]
Product category information [Line Items]
Net sales	[1]	635.7	546.7
U.S. Retail Consumer Foods [Member]
Product category information [Line Items]
Net sales		489.2	402.2
U.S. Retail Consumer Foods [Member] | Peanut butter [Member]
Product category information [Line Items]
Net sales	[1]	199.9	177.9
U.S. Retail Consumer Foods [Member] | Fruit spreads [Member]
Product category information [Line Items]
Net sales	[1]	104.3	89.2
U.S. Retail Consumer Foods [Member] | Frozen handheld [Member]
Product category information [Line Items]
Net sales	[1]	95.5	71.5
U.S. Retail Consumer Foods [Member] | Shortening and oils [Member]
Product category information [Line Items]
Net sales	[1]	77.3	51.5
U.S. Retail Consumer Foods [Member] | Juices and beverages [Member]
Product category information [Line Items]
Net sales	[1]	33.6	31.2
Other
Product category information [Line Items]
Net sales		219.1	241.1
Other | Portion control [Member]
Product category information [Line Items]
Net sales	[1],[2]	24.0	39.4
Other | Baking mixes and ingredients [Member]
Product category information [Line Items]
Net sales	[1],[2]	23.2	13.7
Other | Other [Member]
Product category information [Line Items]
Net sales	[1],[2]	$ 67.8	$ 73.1

[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.