CONTINGENCIES - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Commitments And Contingencies Disclosure [Line Items]
Accrued liabilities related to other regulatory matters which are accounted for in the Other liabilities	$ 4.9

Amounts accrued for regulatory matters not otherwise defined in the taxonomy.

No definition available.

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