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GOODWILL AND INTANGIBLE ASSETS, NET - Rollforward of Carrying Amount of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Roll Forward]
Goodwill, gross (beginning of period)	$ 640.5	$ 635.1
Accumulated impairment losses	(96.4)	(96.4)
Goodwill, net (beginning of period)	544.1	538.7
Acquisitions, net of purchase price adjustments	60.5
Foreign currency translation	0.6	5.4
Reallocation	0.0
Goodwill, gross (end of period)	701.6	640.5
Accumulated impairment losses	(96.4)	(96.4)
Goodwill, net (end of period)	605.2	544.1
U.S. Consumer
Goodwill [Roll Forward]
Goodwill, gross (beginning of period)	229.9	229.9
Accumulated impairment losses	(1.8)	(1.8)
Goodwill, net (beginning of period)	228.1	228.1
Acquisitions, net of purchase price adjustments	0.0
Foreign currency translation	0.0	0.0
Reallocation	15.8
Goodwill, gross (end of period)	245.7	229.9
Accumulated impairment losses	(1.8)	(1.8)
Goodwill, net (end of period)	243.9	228.1
Hawthorne
Goodwill [Roll Forward]
Goodwill, gross (beginning of period)	400.1	394.6
Accumulated impairment losses	(94.6)	(94.6)
Goodwill, net (beginning of period)	305.5	300.0
Acquisitions, net of purchase price adjustments	60.5
Foreign currency translation	0.0	5.5
Reallocation	(15.8)
Goodwill, gross (end of period)	444.8	400.1
Accumulated impairment losses	(94.6)	(94.6)
Goodwill, net (end of period)	350.2	305.5
Other
Goodwill [Roll Forward]
Goodwill, gross (beginning of period)	10.5	10.6
Accumulated impairment losses	0.0	0.0
Goodwill, net (beginning of period)	10.5	10.6
Acquisitions, net of purchase price adjustments	0.0
Foreign currency translation	0.6	(0.1)
Reallocation	0.0
Goodwill, gross (end of period)	11.1	10.5
Accumulated impairment losses	0.0	0.0
Goodwill, net (end of period)	$ 11.1	$ 10.5

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