IMPAIRMENT, RESTRUCTURING AND OTHER - Activity Related to Liabilities Associated with Restructuring (Details) $ in Millions	9 Months Ended
Jun. 27, 2020 USD ($)
Restructuring Reserve [Roll Forward]
Amounts accrued for restructuring and other, beginning balance	$ 11.6
Restructuring and other charges from continuing operations	20.5
Payments and other	(27.7)
Amounts accrued for restructuring and other, ending balance	$ 4.4

The amount of cash paid during the reporting period for charges associated with restructuring charges and other related expenses.

No definition available.

+ Details

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Namespace Prefix:	smg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Restructuring And Other Related Charges, Continuing Operations

+ References

No definition available.

+ Details

Name:	smg_RestructuringAndOtherRelatedChargesContinuingOperations
Namespace Prefix:	smg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

+ Details

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

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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