Cumulative changes in the values of derivative positions that is recorded in unallocated derivative gains (losses).

No definition available.

Name:	sjm_CumulativeNetMarkToMarketValuationOfCertainDerivativePositionsRecognizedInUnallocatedDerivativeGainsLosses
Namespace Prefix:	sjm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain or loss on cash flow hedging derivatives deferred in accumulated other comprehensive income or loss as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	sjm_DeferredGainLossOnCashFlowHedgesIncludedInAccumulatedOtherComprehensiveIncomeOrLoss
Namespace Prefix:	sjm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Derivative financial instruments.

+ References

No definition available.

+ Details

Name:	sjm_DerivativeFinancialInstrumentsTextualAbstract
Namespace Prefix:	sjm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before tax, deferred in accumulated other comprehensive income (AOCI) for gain (loss) from discontinuance of cash flow hedge.

+ References

No definition available.

+ Details

Name:	sjm_OtherComprehensiveIncomeLossCashFlowHedgeDiscontinuanceBeforeTax
Namespace Prefix:	sjm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Tax impact related to deferred gains or losses on cash flow hedges included in accumulated other comprehensive loss.

+ References

No definition available.

+ Details

Name:	sjm_TaxImpactRelatedToCashFlowHedgesIncludedInAccumulatedOtherComprehensiveIncomeLoss
Namespace Prefix:	sjm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of expense charged against earnings by an Entity to record deferred gains and losses on hedge instruments. Examples include gain on economic hedges, amortization of gain on designated fair value hedge and so forth.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

Name:	us-gaap_AmortizationOfDeferredHedgeGains
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

+ Details

Name:	us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

Name:	us-gaap_DerivativeCollateralObligationToReturnCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

+ Details

Name:	us-gaap_DerivativeCollateralRightToReclaimCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeRemainingMaturity1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

Name:	us-gaap_GainLossOnContractTermination
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net amount of nonoperating interest income (expense).

+ References

No definition available.

+ Details

Name:	us-gaap_InterestIncomeExpenseNonoperatingNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_FairValueHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sjm_TotalThroughQ32021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sjm_TwoThousandTwentyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=sjm_TwoThousandAndTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_CashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=sjm_AccruedandPrepaidInterestNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Derivative Financial Instruments (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Apr. 30, 2020	Apr. 30, 2015
Derivative Financial Instruments (Textual) [Abstract]
Collateral received	$ 5.6		$ 5.6
Collateral pledged					$ 43.2
Interest expense – net	(43.5)	$ (45.1)	(134.7)	$ (143.6)
Cumulative net mark-to-market valuation of certain derivative positions recognized in unallocated derivative gains (losses)			$ 48.6		(32.9)
Commodity contracts
Derivative Financial Instruments (Textual) [Abstract]
Derivative instrument maturity			1 year
Foreign currency exchange contracts
Derivative Financial Instruments (Textual) [Abstract]
Derivative instrument maturity			1 year
Interest rate contracts
Derivative Financial Instruments (Textual) [Abstract]
Deferred pre-tax net gain (loss) included in accumulated other comprehensive loss					(239.8)
Deferred pre-tax gain (loss) included in accumulated other comprehensive loss	(230.7)		$ (230.7)		(241.1)
Tax impact related to deferred losses and gains on cash flow hedges included in accumulated other comprehensive loss	53.3		53.3		$ 55.5
Effective portion of the hedge loss reclassified to interest expense over the next twelve months			(13.7)
Interest rate swap \| Fair Value Hedging [Member]
Derivative Financial Instruments (Textual) [Abstract]
Amortization of deferred gain on early termination agreement	$ 2.2	$ 2.1	6.4	$ 6.2
Total Through Q3 2021 \| Fair Value Hedging [Member]
Derivative Financial Instruments (Textual) [Abstract]
Amortization of deferred gain on early termination agreement			47.5
2021 [Member] \| Fair Value Hedging [Member]
Derivative Financial Instruments (Textual) [Abstract]
Amortization of deferred gain on early termination agreement			2.0
2022 [Member] \| Fair Value Hedging [Member]
Derivative Financial Instruments (Textual) [Abstract]
Amortization of deferred gain on early termination agreement			$ 4.0
Cash [Member] \| Interest rate swap \| Fair Value Hedging [Member]
Derivative Financial Instruments (Textual) [Abstract]
Gain (loss) on early termination agreement						$ 58.1
Accrued and Prepaid Interest, Net [Member] \| Interest rate swap \| Fair Value Hedging [Member]
Derivative Financial Instruments (Textual) [Abstract]
Gain (loss) on early termination agreement						$ 4.6