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LEASES - Additional Information (Details) $ in Millions | Apr. 03, 2021 USD ($)
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Leases [Abstract] |
Expected lease liability on operating leases that are yet to commence | $ 45.3
Residual value of leased asset | $ 4.1

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- 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

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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