Guarantor and Non-Guarantor Financial Information (Details 2) - USD ($) $ in Millions	6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Net Cash Provided by Operating Activities	$ 375.3	$ 582.5
Investing Activities
Business acquired, net of cash acquired	0.0	7.9
Additions to property, plant, and equipment	(84.0)	(117.4)
Proceeds from disposal of property, plant, and equipment	0.4	0.2
(Disbursements of) repayments from intercompany loans	0.0	0.0
Other – net	(12.7)	13.3
Net Cash Used for Investing Activities	(96.3)	(96.0)
Financing Activities
Short-term borrowings – net	122.0	144.0
Repayments of long-term debt	(200.0)	(450.0)
Quarterly dividends paid	(164.9)	(156.5)
Purchase of treasury shares	(18.8)	(7.4)
Intercompany payable	0.0	0.0
Other – net	0.6	0.5
Net Cash Used for Financing Activities	(261.1)	(469.4)
Effect of exchange rate changes on cash	(5.9)	(3.7)
Net increase (decrease) in cash and cash equivalents	12.0	13.4
Cash and cash equivalents at beginning of period	109.8	125.6
Cash and Cash Equivalents at End of Period	121.8	139.0
Eliminations [Member]
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Net Cash Provided by Operating Activities	0.0	0.0
Investing Activities
Business acquired, net of cash acquired		0.0
Additions to property, plant, and equipment	0.0	0.0
Proceeds from disposal of property, plant, and equipment	0.0	0.0
(Disbursements of) repayments from intercompany loans	260.2	421.3
Other – net	0.0	0.0
Net Cash Used for Investing Activities	260.2	421.3
Financing Activities
Short-term borrowings – net	0.0	0.0
Repayments of long-term debt	0.0	0.0
Quarterly dividends paid	0.0	0.0
Purchase of treasury shares	0.0	0.0
Intercompany payable	(260.2)	(421.3)
Other – net	0.0	0.0
Net Cash Used for Financing Activities	(260.2)	(421.3)
Effect of exchange rate changes on cash	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0
Cash and cash equivalents at beginning of period	0.0	0.0
Cash and Cash Equivalents at End of Period	0.0	0.0
The J.M. Smucker Company (Parent) [Member]
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Net Cash Provided by Operating Activities	22.4	104.3
Investing Activities
Business acquired, net of cash acquired		0.0
Additions to property, plant, and equipment	(17.0)	(56.3)
Proceeds from disposal of property, plant, and equipment	0.0	0.0
(Disbursements of) repayments from intercompany loans	0.0	0.0
Other – net	(0.1)	0.0
Net Cash Used for Investing Activities	(17.1)	(56.3)
Financing Activities
Short-term borrowings – net	122.0	144.0
Repayments of long-term debt	(200.0)	(450.0)
Quarterly dividends paid	(164.9)	(156.5)
Purchase of treasury shares	(18.8)	(7.4)
Intercompany payable	260.2	421.3
Other – net	0.6	0.5
Net Cash Used for Financing Activities	(0.9)	(48.1)
Effect of exchange rate changes on cash	0.0	0.0
Net increase (decrease) in cash and cash equivalents	4.4	(0.1)
Cash and cash equivalents at beginning of period	7.0	7.1
Cash and Cash Equivalents at End of Period	11.4	7.0
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Net Cash Provided by Operating Activities	87.9	73.2
Investing Activities
Business acquired, net of cash acquired		0.0
Additions to property, plant, and equipment	(18.8)	(20.3)
Proceeds from disposal of property, plant, and equipment	0.0	0.1
(Disbursements of) repayments from intercompany loans	(70.3)	(53.3)
Other – net	1.2	0.3
Net Cash Used for Investing Activities	(87.9)	(73.2)
Financing Activities
Short-term borrowings – net	0.0	0.0
Repayments of long-term debt	0.0	0.0
Quarterly dividends paid	0.0	0.0
Purchase of treasury shares	0.0	0.0
Intercompany payable	0.0	0.0
Other – net	0.0	0.0
Net Cash Used for Financing Activities	0.0	0.0
Effect of exchange rate changes on cash	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0
Cash and cash equivalents at beginning of period	0.0	0.0
Cash and Cash Equivalents at End of Period	0.0	0.0
Non-Guarantor Subsidiaries [Member]
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Net Cash Provided by Operating Activities	265.0	405.0
Investing Activities
Business acquired, net of cash acquired		7.9
Additions to property, plant, and equipment	(48.2)	(40.8)
Proceeds from disposal of property, plant, and equipment	0.4	0.1
(Disbursements of) repayments from intercompany loans	(189.9)	(368.0)
Other – net	(13.8)	13.0
Net Cash Used for Investing Activities	(251.5)	(387.8)
Financing Activities
Short-term borrowings – net	0.0	0.0
Repayments of long-term debt	0.0	0.0
Quarterly dividends paid	0.0	0.0
Purchase of treasury shares	0.0	0.0
Intercompany payable	0.0	0.0
Other – net	0.0	0.0
Net Cash Used for Financing Activities	0.0	0.0
Effect of exchange rate changes on cash	(5.9)	(3.7)
Net increase (decrease) in cash and cash equivalents	7.6	13.5
Cash and cash equivalents at beginning of period	102.8	118.5
Cash and Cash Equivalents at End of Period	$ 110.4	$ 132.0