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Pensions and Other Postretirement Benefits (Details Textual) $ in Millions | 12 Months Ended
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Apr. 30, 2015 USD ($) MultiemployerPensionPlans shares | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($)
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Company contributions | $ 15.7 | $ 9.4 | $ 40.0
Pensions and Other Postretirement Benefits (Additional Textual) [Abstract] |  |  |
Eligibility condition for covered employees to avail the benefits of unfunded, defined postretirement plans that provide health care and life insurance benefits | when they reach age 55 and have attained 10 years of credited service |  |
Expected amount to be recognized during 2016 of amortization of net actuarial losses in net periodic benefit cost | $ 10.7 |  |
Expected amount to be recognized during 2016 in prior service cost as net periodic benefit cost | $ 0.5 |  |
Money market holdings maturity period | Three months or less |  |
Corporate bonds range | 10 to 13 years |  |
Market value of company's common shares included in equity securities | $ 36.8 |  |
Dividends paid on company's common shares included in equity securities | 0.8 |  |
Expected benefit payments for the defined benefit pension and other postretirement in 2016 | 49.9 |  |
Expected benefit payments for the defined benefit pension and other postretirement in 2017 | 51.0 |  |
Expected benefit payments for the defined benefit pension and other postretirement in 2018 | 56.6 |  |
Expected benefit payments for the defined benefit pension and other postretirement in 2019 | 53.5 |  |
Expected benefit payments for the defined benefit pension and other postretirement in 2020 | 60.2 |  |
Expected benefit payments for the defined benefit pension and other postretirement in 2021 through 2025 | $ 304.0 |  |
Annual change in the assumed health care cost | One-percentage point |  |
Multiemployer plan actual funded status |  | 65.10% |
Funded status zone | Red |  |
Number of multiemployer pension plans | MultiemployerPensionPlans | 1 |  |
Company's common shares included in equity securities | shares | 317,552 |  |
Limit of active participants under which average life expectancy will be used to amortize gains and losses | 5.00% |  |
Multiemployer Plans, Pension [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Plan Tax ID | 526118572 |  |
Red Zone [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Funded Status | Less than 65 percent |  |
Yellow Zone [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Funded Status | Between 65 and less than 80 percent |  |
The J. M. Smucker Company [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Multiemployer plan contributions | $ 0.1 |  |
GreenZoneMember |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Funded Status | At least 80 percent |  |
Big Heart [Member] | The J. M. Smucker Company [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Multiemployer plan contributions | $ 1.7 |  |
Equity Securities [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Approximate percentage of assets to be invested in company's current investment policy | 50.00% |  |
Fixed - Income Securities [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Approximate percentage of assets to be invested in company's current investment policy | 50.00% |  |
Defined Benefit Pension Plans [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Expected amount to be contributed by the Company to the defined benefit pension plans in 2016 | $ 3.5 |  |
Actual return on plan assets | 41.7 | $ 25.0 |
Company contributions | $ 15.7 | $ 9.4 |
Defined benefit plan actual rate of return on plan assets | 11.60% | 6.90% |
U. S. Other Postretirement Benefit Plans [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Assumed health care trend rate for next fiscal year | 7.50% |  |
U. S. Other Postretirement Benefit Plans [Member] | U.S. plans in 2026 [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Assumed health care trend rate for participants under age 65 | 5.00% |  |
Canadian Other Postretirement Benefit Plans [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Assumed health care trend rate for next fiscal year | 5.00% |  |
Actual return on plan assets | $ 0.0 | $ 0.0 |
Company contributions | $ 0.7 | $ 0.8 |
Canadian Other Postretirement Benefit Plans [Member] | Canadian plans in 2017 [Member] |  |  |
Schedule of defined benefit plans disclosures (Textual) [Abstract] |  |  |
Assumed health care trend rate for participants under age 65 | 4.50% |  |

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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition General information regarding defined benefit plans. A defined benefit pension plan is a plan that defines an amount of pension benefit to be provided, usually as a function of one or more factors such as age, years of service, or compensation. An other postretirement defined benefit plan is an arrangement that is mutually understood by an employer and its employees, whereby an employer undertakes to provide its employees with benefits other than pensions, after they retire in exchange for their services over a specified period of time, upon attaining a specified age while in service, or a combination of both. Any plan that is not a defined contribution plan is a defined benefit plan. General descriptive information about the employer's defined benefit plans, including employee groups covered, type of benefit formula, type of benefits, cost sharing arrangements, funding policy, types of assets held, and significant nonbenefit liabilities, if any. Also includes information pertaining to multiple employer plans, which are accounted for as single-employer plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Defined Benefit Postretirement Plan -URI http://asc.fasb.org/extlink&oid=6749240 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Defined Benefit Pension Plan -URI http://asc.fasb.org/extlink&oid=6510300 + Details
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