Guarantor and Non-Guarantor Financial Information (Details 2) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Net Cash Provided by (Used for) Operating Activities	$ 304.3	$ 238.9
Investing Activities
Additions to property, plant, and equipment	(69.6)	(50.2)
Repayments from (disbursements of) intercompany loans	0.0	0.0
Other – net	31.5	(12.3)
Net Cash Provided by (Used for) Investing Activities	(38.1)	(62.5)
Financing Activities
Short-term borrowings (repayments) – net	(170.1)	22.0
Repayments of long-term debt	0.0	(100.0)
Quarterly dividends paid	(84.9)	(77.8)
Purchase of treasury shares	(6.6)	(18.1)
Intercompany payable	0.0	0.0
Other – net	1.5	0.7
Net Cash Provided by (Used for) Financing Activities	(260.1)	(173.2)
Effect of exchange rate changes on cash	10.3	(3.4)
Net increase (decrease) in cash and cash equivalents	16.4	(0.2)
Cash and cash equivalents at beginning of period	166.8	109.8
Cash and Cash Equivalents at End of Period	183.2	109.6
Eliminations [Member]
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Net Cash Provided by (Used for) Operating Activities	0.0	0.0
Investing Activities
Additions to property, plant, and equipment	0.0	0.0
Repayments from (disbursements of) intercompany loans	194.4	91.7
Other – net	0.0	0.0
Net Cash Provided by (Used for) Investing Activities	194.4	91.7
Financing Activities
Short-term borrowings (repayments) – net	0.0	0.0
Repayments of long-term debt		0.0
Quarterly dividends paid	0.0	0.0
Purchase of treasury shares	0.0	0.0
Intercompany payable	(194.4)	(91.7)
Other – net	0.0	0.0
Net Cash Provided by (Used for) Financing Activities	(194.4)	(91.7)
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 (Used for) Operating Activities	82.1	87.0
Investing Activities
Additions to property, plant, and equipment	(14.1)	(7.0)
Repayments from (disbursements of) intercompany loans	0.0	0.0
Other – net	0.1	(0.1)
Net Cash Provided by (Used for) Investing Activities	(14.0)	(7.1)
Financing Activities
Short-term borrowings (repayments) – net	(170.1)	22.0
Repayments of long-term debt		(100.0)
Quarterly dividends paid	(84.9)	(77.8)
Purchase of treasury shares	(6.6)	(18.1)
Intercompany payable	194.4	91.7
Other – net	1.5	0.7
Net Cash Provided by (Used for) Financing Activities	(65.7)	(81.5)
Effect of exchange rate changes on cash	0.0	0.0
Net increase (decrease) in cash and cash equivalents	2.4	(1.6)
Cash and cash equivalents at beginning of period	8.5	7.0
Cash and Cash Equivalents at End of Period	10.9	5.4
Subsidiary Guarantors [Member]
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS
Net Cash Provided by (Used for) Operating Activities	22.2	46.3
Investing Activities
Additions to property, plant, and equipment	(12.9)	(12.7)
Repayments from (disbursements of) intercompany loans	(14.9)	(31.5)
Other – net	5.6	(2.1)
Net Cash Provided by (Used for) Investing Activities	(22.2)	(46.3)
Financing Activities
Short-term borrowings (repayments) – net	0.0	0.0
Repayments of long-term debt		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 Provided by (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 (Used for) Operating Activities	200.0	105.6
Investing Activities
Additions to property, plant, and equipment	(42.6)	(30.5)
Repayments from (disbursements of) intercompany loans	(179.5)	(60.2)
Other – net	25.8	(10.1)
Net Cash Provided by (Used for) Investing Activities	(196.3)	(100.8)
Financing Activities
Short-term borrowings (repayments) – net	0.0	0.0
Repayments of long-term debt		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 Provided by (Used for) Financing Activities	0.0	0.0
Effect of exchange rate changes on cash	10.3	(3.4)
Net increase (decrease) in cash and cash equivalents	14.0	1.4
Cash and cash equivalents at beginning of period	158.3	102.8
Cash and Cash Equivalents at End of Period	$ 172.3	$ 104.2