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LEASES - Additional Information (Details) $ in Millions	Jan. 02, 2021 USD ($)
Leases [Abstract]
Expected lease liability on operating leases that are yet to commence	$ 45.3
Residual value of leased asset	$ 4.1

X

- Definition

Lessee, Operating Lease, Lease Not Yet Commenced, Liability

+ References

No definition available.

+ Details

Name:	smg_LesseeOperatingLeaseLeaseNotYetCommencedLiability
Namespace Prefix:	smg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of residual asset covered by residual value guarantee. Excludes guarantee considered to be lease payments for lessor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 7
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919381-209981

+ Details

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