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EQUITY - Schedule of Share-Based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Share-based compensation	$ 40.6	$ 57.9	$ 38.4
Related tax benefit recognized	$ 7.4	$ 14.6	$ 9.5

X

- Definition

Share-Based Compensation Expense, Including Certain Impairment, Restructuring, And Other Charges

+ References

No definition available.

+ Details

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Namespace Prefix:	smg_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- References

No definition available.

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