Net Sales for the second and third fiscal quarters percentage of annual net sales.

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Quarterly Financial Information [Line Items]

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Restructuring Charges, Recoveries

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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QUARTERLY CONSOLIDATED FINANCIAL INFORMATION (UNAUDITED) - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended	12 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 30, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Jul. 01, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Quarterly Financial Information [Line Items]
Percentage of annual net sales from combined second and third quarter sales									75.00%	75.00%	75.00%	75.00%
Restructuring costs	$ 11.2	$ 4.2	$ 3.4	$ 2.0	$ 7.5			$ 9.3
Restructuring recoveries	(4.4)					$ (6.0)	$ (36.7)
U.S. Consumer
Quarterly Financial Information [Line Items]
Restructuring costs										$ 6.7
U.S. Consumer \| Trademark
Quarterly Financial Information [Line Items]
Impairment charge	1.0
Historical acquisition
Quarterly Financial Information [Line Items]
Restructuring recoveries	(4.4)
International Business
Quarterly Financial Information [Line Items]
Restructuring costs										(0.4)	$ 3.6	$ 9.8
Restructuring transaction related charges										15.5	2.5
Bonus S
Quarterly Financial Information [Line Items]
Restructuring costs								5.4
Restructuring recoveries					(0.5)
Insurance reimbursement recoveries						(5.4)	(49.0)
Project Focus
Quarterly Financial Information [Line Items]
Restructuring costs											3.9
Project Focus \| Scotts LawnService
Quarterly Financial Information [Line Items]
Restructuring costs							9.0					$ 1.4
Restructuring transaction related charges		0.1	0.1	0.6			1.6	3.0		$ 0.8	$ 4.6
Deal related costs \| International Business
Quarterly Financial Information [Line Items]
Restructuring transaction related charges	6.7	$ 4.1	$ 3.3	$ 1.4	0.2		$ 1.7	$ 0.9
Restructuring recoveries						(0.3)
Termination benefits
Quarterly Financial Information [Line Items]
Restructuring costs	8.3
Employee severance \| Project Focus
Quarterly Financial Information [Line Items]
Restructuring recoveries	$ (0.4)					$ (0.3)
Employee severance \| Project Focus \| Continuing Operations
Quarterly Financial Information [Line Items]
Restructuring costs					4.2
Employee severance \| Project Focus \| Discontinued Operations
Quarterly Financial Information [Line Items]
Restructuring costs					$ 3.6