INVESTMENT IN UNCONSOLIDATED AFFILIATES - Additional Information (Details) - USD ($)	3 Months Ended			6 Months Ended
	Mar. 31, 2018	Sep. 30, 2017	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017	Apr. 13, 2016
Schedule of Equity Method Investments [Line Items]
Accounts receivable, net	$ 598,000,000	$ 197,700,000	$ 978,300,000	$ 598,000,000	$ 978,300,000
Distributions in excess of investment in unconsolidated affiliate	21,900,000	21,900,000	0	21,900,000	0
Investments in loans receivable				(7,700,000)	0
Equity in (income) loss of unconsolidated affiliates	(1,500,000)		24,100,000	(2,100,000)	37,300,000
TruGreen Joint Venture
Schedule of Equity Method Investments [Line Items]
Estimated market value						$ 294,000,000
Second lien term loan investment						$ 18,000,000
Carrying value of second lien term loan	18,100,000		18,000,000	18,100,000	18,000,000
Reimbursements	100,000		14,700,000	600,000	33,700,000
Accounts receivable, net	500,000		8,300,000	500,000	8,300,000
Distributions received from unconsolidated affiliates	0		0	0	2,200,000
Indemnification asset	4,200,000		7,400,000	4,200,000	7,400,000
Distributions in excess of investment in unconsolidated affiliate	$ 21,900,000			$ 21,900,000
Restructuring and other charges			2,100,000		11,700,000
Nonrecurring integration and separation costs			0		7,900,000
Fair value write-down adjustment of deferred revenue and advertising			$ 2,100,000		$ 3,800,000
Scotts Lawnservice | TruGreen Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity ownership percentage	30.00%			30.00%		30.00%
U.S. Consumer | Unconsolidated Subsidiary Whose Products Support The Professional U.S. Industrial, Turf And Ornamental Market
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated subsidiary		$ 29,400,000
Investment in joint venture	$ 2,100,000			$ 7,400,000