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Pensions and Other Postretirement Benefits (Details Textual) $ in Millions	12 Months Ended
	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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Schedule of defined benefit plans disclosures.

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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.

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Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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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.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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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.

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