INVESTMENT IN UNCONSOLIDATED AFFILIATES - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended						12 Months Ended
	Apr. 13, 2016	Aug. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 30, 2016	Jan. 02, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Investments in and Advances to Affiliates [Line Items]
Accounts receivable, net			$ 197.7				$ 127.0		$ 197.7	$ 127.0
Distributions intended to cover required tax payments									57.4	194.1	$ 0.0
Proceeds from dividend payments received									0.0	0.0
Distributions in excess of investment in unconsolidated affiliate			21.9				0.0		21.9	0.0
Equity investment in subsidiaries			0.0				0.0		0.0	0.0
Equity in (income) loss of unconsolidated affiliates									29.0	(7.8)	$ 0.0
Restructuring costs			11.2	$ 4.2	$ 3.4	$ 2.0	7.5	$ 9.3
TruGreen Joint Venture
Investments in and Advances to Affiliates [Line Items]
Estimated fair value on transaction date	$ 294.0
Excess distribution recorded as return of investment	196.2
Investment in term loan financing	$ 18.0		18.1				18.0		18.1	18.0
Reimbursement of term loan financing									40.2	52.6
Accounts receivable, net			0.4				14.9		0.4	14.9
Indemnification asset			4.8				$ 9.6		4.8	9.6
Distributions intended to cover required tax payments									3.6	7.5
Proceeds from dividend payments received									87.1
Distributions in excess of investment in unconsolidated affiliate			21.9						21.9
Restructuring costs		$ 7.2							25.2	11.7
Restructuring transaction costs									1.3	6.0
Nonrecurring integration and separation costs									12.1	4.4
Noncash write-down adjustment									4.6	$ 1.3
U.S. Consumer | Industrial Turf and Ornamental Market Investment
Investments in and Advances to Affiliates [Line Items]
Equity investment in subsidiaries			$ 29.4						$ 29.4
Scotts LawnService | TruGreen Joint Venture
Investments in and Advances to Affiliates [Line Items]
Minority equity interest (as a percent)			30.00%						30.00%