Name:	smg_EBPEmployerContributionMaximumVestingAge
Namespace Prefix:	smg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions.

No definition available.

Name:	smg_EBPEmployerContributionVestingServicePeriod
Namespace Prefix:	smg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term

No definition available.

Name:	smg_EBPNoteReceivableFromParticipantAccountPrimaryResidenceMaximumBorrowingTerm
Namespace Prefix:	smg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term

No definition available.

Name:	smg_EBPNoteReceivableFromParticipantGeneralLoanMaximumBorrowingTerm
Namespace Prefix:	smg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold.

No definition available.

Name:	smg_EBPParticipantContributionAutomaticAnnualIncreaseDeferralRate
Namespace Prefix:	smg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

EBP, Participant Contribution, Pre Tax, Maximum Annual Contribution to Eligible Compensation, Percentage

No definition available.

Name:	smg_EBPParticipantContributionPreTaxMaximumAnnualContributionToEligibleCompensationPercentage
Namespace Prefix:	smg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

EBP, Retirement Age

No definition available.

Name:	smg_EBPRetirementAge
Namespace Prefix:	smg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionMatchingPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingAmount
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

Name:	us-gaap-ebp_EmployeeBenefitPlanNoteReceivableFromParticipantAccountMaximumBorrowingToTotalAccountPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Name:	us-gaap-ebp_EmployeeBenefitPlanParticipantContributionAutomaticDeferralRate
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Name:	dei_LegalEntityAxis=smg_EBP001Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	smg_EBPEmployerContributionTypeAxis=smg_EBPDiscretionaryProfitSharingContributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	smg_EBPEmployerContributionTypeAxis=smg_EBPFixedRateContributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	smg_EBPEmployerContributionTypeAxis=smg_EBPEmployerMatchingContributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	smg_ThresholdAxis=smg_ThresholdOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	smg_ThresholdAxis=smg_ThresholdTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: