INVESTMENT IN UNCONSOLIDATED AFFILIATES - Summary of Financial Information for the TruGreen Joint Venture (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Condensed Balance Sheet
Cash and cash equivalents	$ 33.9				$ 120.5				$ 33.9	$ 120.5	$ 28.6	$ 50.8
Other current assets	59.9				67.1				59.9	67.1
Intangible assets, net	857.3				748.9				857.3	748.9
Goodwill	543.0				441.6				543.0	441.6	371.9
Other assets	201.6				176.0				201.6	176.0
Total assets	3,054.5				2,747.0				3,054.5	2,747.0
Current liabilities	612.7				544.5				612.7	544.5
Current portion of debt	132.6				143.1				132.6	143.1
Long-term debt	1,883.8				1,258.0				1,883.8	1,258.0
Other liabilities	176.5				260.9				176.5	260.9
Equity	354.6				648.8				354.6	648.8
Total liabilities and equity	3,054.5				2,747.0				3,054.5	2,747.0
Condensed Income Statement
Revenue	433.9	$ 994.6	$ 1,013.3	$ 221.5	376.7	$ 973.4	$ 1,084.6	$ 207.4	2,663.4	2,642.1	2,506.2
Gross margin	73.7	347.6	409.2	34.0	88.1	383.4	464.3	36.8	864.6	972.6	900.3
Selling and administrative expenses									540.1	550.9	518.0
Amortization expense									30.0	25.0	19.7
Interest expense									86.4	76.1	62.9
Net income (loss) attributable to controlling interest	(147.0)	$ 82.9	$ 148.9	$ (21.2)	(33.4)	$ 151.9	$ 165.1	$ (65.3)	63.7	218.3	315.3
Joint Ventures
Condensed Balance Sheet
Cash and cash equivalents	110.6				26.4				110.6	26.4
Other current assets	198.6				180.9				198.6	180.9
Intangible assets, net	809.8				860.7				809.8	860.7
Goodwill	199.8				184.0				199.8	184.0
Other assets	222.5				229.5				222.5	229.5
Total assets	1,541.3				1,481.5				1,541.3	1,481.5
Current liabilities	276.5				221.0				276.5	221.0
Current portion of debt	12.5				15.5				12.5	15.5
Long-term debt	981.9				987.5				981.9	987.5
Other liabilities	56.7				57.9				56.7	57.9
Equity	213.7				199.6				213.7	199.6
Total liabilities and equity	$ 1,541.3				$ 1,481.5				1,541.3	1,481.5
Condensed Income Statement
Revenue									1,427.4	1,340.2	808.4
Gross margin									475.0	429.7	287.5
Selling and administrative expenses									330.2	316.8	167.8
Amortization expense									62.0	72.8	27.1
Interest expense									74.5	69.9	30.8
Restructuring and other charges									14.6	67.5	34.8
Net income (loss) attributable to controlling interest									$ (6.3)	$ (97.3)	$ 27.0