SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Significant Accounting Policies [Line Items]
Capitalized Computer Software, Net	$ 21.8	$ 17.5
Product Liability Accrual, Period Expense			8.2
Percentage of annual net sales from combined second and third quarter sales	75.00%	75.00%	75.00%
Advertising expenses	143.6	142.2	168.9
Research and development charge	48.4	46.4	50.1
Adjustment to reflect inventories at net realizable values	18.4	19.7
Interest capitalized on capital projects	0.4	0.8	0.9
Noncash investing activities for unpaid liabilities incurred	7.0	7.3	17.3
Amortization of capitalized internal use computer software	8.3	7.3	8.0
Research and Development Expense
Significant Accounting Policies [Line Items]
Product registration costs	12.6	12.4	14.0
Minimum [Member]
Significant Accounting Policies [Line Items]
Intangible assets amortization period	3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Intangible assets amortization period	25 years
Global Consumer [Member]
Significant Accounting Policies [Line Items]
Deferred Advertising Costs	1.9	0
Scotts Lawnservice [Member]
Significant Accounting Policies [Line Items]
Deferred Advertising Costs	$ 1.3	$ 0