Guarantor and Non-Guarantor Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net sales	$ 1,913.9	$ 2,077.7	$ 3,729.7	$ 4,029.7
Cost of products sold	1,171.0	1,290.4	2,264.1	2,513.7
Gross Profit	742.9	787.3	1,465.6	1,516.0
Selling, distribution, and administrative expenses and other special project costs	389.7	420.4	767.9	830.9
Amortization	51.8	53.0	103.5	106.0
Other operating (income) expense – net	(1.9)	0.1	(2.9)	(1.8)
Operating Income	303.3	313.8	597.1	580.9
Interest (expense) income - net	(41.0)	(42.6)	(82.5)	(87.0)
Other income (expense) – net	3.2	(1.6)	4.3	(1.5)
Equity in net earnings of subsidiaries	0.0	0.0	0.0	0.0
Income Before Income Taxes	265.5	269.6	518.9	492.4
Income taxes	88.2	93.6	171.6	180.0
Net Income	177.3	176.0	347.3	312.4
Other comprehensive (loss) income, net of tax	(10.2)	2.1	(7.7)	(19.0)
Comprehensive Income (Loss)	167.1	178.1	339.6	293.4
Eliminations [Member]
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net sales	(1,657.0)	(1,407.3)	(3,727.7)	(2,748.3)
Cost of products sold	(1,670.9)	(1,408.8)	(3,726.4)	(2,749.4)
Gross Profit	13.9	1.5	(1.3)	1.1
Selling, distribution, and administrative expenses and other special project costs	0.0	0.0	0.0	0.0
Amortization	0.0	0.0	0.0	0.0
Other operating (income) expense – net	0.0	0.0	0.0	0.0
Operating Income	13.9	1.5	(1.3)	1.1
Interest (expense) income - net	0.0	0.0	0.0	0.0
Other income (expense) – net	0.0	0.0	0.0	0.0
Equity in net earnings of subsidiaries	(227.5)	(166.1)	(417.6)	(320.7)
Income Before Income Taxes	(213.6)	(164.6)	(418.9)	(319.6)
Income taxes	0.0	0.0	0.0	0.0
Net Income	(213.6)	(164.6)	(418.9)	(319.6)
Other comprehensive (loss) income, net of tax	9.8	0.7	23.0	22.7
Comprehensive Income (Loss)	(203.8)	(163.9)	(395.9)	(296.9)
The J.M. Smucker Company (Parent) [Member]
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net sales	527.9	827.2	1,503.9	1,588.0
Cost of products sold	380.8	629.8	1,187.4	1,239.7
Gross Profit	147.1	197.4	316.5	348.3
Selling, distribution, and administrative expenses and other special project costs	86.5	62.7	171.4	124.9
Amortization	2.6	1.0	5.1	2.1
Other operating (income) expense – net	0.1	0.0	0.3	(0.1)
Operating Income	57.9	133.7	139.7	221.4
Interest (expense) income - net	(41.3)	(42.8)	(83.0)	(87.4)
Other income (expense) – net	(1.0)	0.6	1.1	3.5
Equity in net earnings of subsidiaries	171.5	116.8	306.0	223.2
Income Before Income Taxes	187.1	208.3	363.8	360.7
Income taxes	9.8	32.3	16.5	48.3
Net Income	177.3	176.0	347.3	312.4
Other comprehensive (loss) income, net of tax	(10.2)	2.1	(7.7)	(19.0)
Comprehensive Income (Loss)	167.1	178.1	339.6	293.4
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net sales	328.7	341.7	639.3	639.9
Cost of products sold	302.7	314.3	582.6	586.5
Gross Profit	26.0	27.4	56.7	53.4
Selling, distribution, and administrative expenses and other special project costs	10.8	10.2	20.9	20.8
Amortization	0.0	0.0	0.0	0.0
Other operating (income) expense – net	(0.3)	0.0	(0.3)	0.4
Operating Income	15.5	17.2	36.1	32.2
Interest (expense) income - net	0.3	0.3	0.6	0.6
Other income (expense) – net	2.6	0.1	2.7	0.1
Equity in net earnings of subsidiaries	37.9	32.0	72.8	65.2
Income Before Income Taxes	56.3	49.6	112.2	98.1
Income taxes	0.1	0.1	0.2	0.2
Net Income	56.2	49.5	112.0	97.9
Other comprehensive (loss) income, net of tax	0.3	0.2	0.6	0.5
Comprehensive Income (Loss)	56.5	49.7	112.6	98.4
Non-Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net sales	2,714.3	2,316.1	5,314.2	4,550.1
Cost of products sold	2,158.4	1,755.1	4,220.5	3,436.9
Gross Profit	555.9	561.0	1,093.7	1,113.2
Selling, distribution, and administrative expenses and other special project costs	292.4	347.5	575.6	685.2
Amortization	49.2	52.0	98.4	103.9
Other operating (income) expense – net	(1.7)	0.1	(2.9)	(2.1)
Operating Income	216.0	161.4	422.6	326.2
Interest (expense) income - net	0.0	(0.1)	(0.1)	(0.2)
Other income (expense) – net	1.6	(2.3)	0.5	(5.1)
Equity in net earnings of subsidiaries	18.1	17.3	38.8	32.3
Income Before Income Taxes	235.7	176.3	461.8	353.2
Income taxes	78.3	61.2	154.9	131.5
Net Income	157.4	115.1	306.9	221.7
Other comprehensive (loss) income, net of tax	(10.1)	(0.9)	(23.6)	(23.2)
Comprehensive Income (Loss)	$ 147.3	$ 114.2	$ 283.3	$ 198.5