GOODWILL AND INTANGIBLE ASSETS, NET (Tables)

12 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Rollforward of Carrying Amount of Goodwill by Reportable Segment

The following table displays a rollforward of the carrying amount of goodwill by reportable segment:

	U.S. Consumer		Hawthorne		Other		Total
Goodwill	$	245.7	$	444.8	$	11.1	$	701.6
Accumulated impairment losses	(1.8)		(94.6)		—		(96.4)
Balance at September 30, 2021	243.9		350.2		11.1		605.2
Acquisitions and measurement-period adjustments	—		180.8		—		180.8
Foreign currency translation	—		(8.6)		(1.0)		(9.6)
Impairment	—		(522.4)		—		(522.4)
Goodwill	$	245.7	$	617.0	$	10.1	$	872.8
Accumulated impairment losses	(1.8)		(617.0)		—		(618.8)
Balance at September 30, 2022	243.9		—		10.1		254.0
Foreign currency translation	—		—		0.2		0.2
Impairment	—		—		(10.3)		(10.3)
Goodwill	$	245.7	$	617.0	$	10.3	$	873.0
Accumulated impairment losses	(1.8)		(617.0)		(10.3)		(629.1)
Balance at September 30, 2023	$	243.9	$	—	$	—	$	243.9

Schedule of Finite-lived Intangible Assets

The following table presents intangible assets, net of accumulated amortization and impairment charges:

	September 30, 2023						September 30, 2022
	Gross Carrying Amount		Accumulated Amortization/ Impairment Charges		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization/ Impairment Charges		Net Carrying Amount
Finite-lived intangible assets:
Trade names	$	322.4	$	(260.7)	$	61.7	$	318.4	$	(174.3)	$	144.1
Customer relationships	251.5		(216.1)		35.4		251.1		(158.4)		92.7
Technology	50.1		(44.5)		5.6		49.1		(43.3)		5.8
Other	34.9		(24.8)		10.1		34.7		(21.0)		13.7
Total finite-lived intangible assets, net					112.8						256.3
Indefinite-lived intangible assets:
Indefinite-lived trade names					168.2						168.2
Roundup® marketing agreement amendment					155.7						155.7
Total indefinite-lived intangible assets					323.9						323.9
Total intangible assets, net					$	436.7					$	580.2

Schedule of Indefinite-lived Intangible Assets

The following table presents intangible assets, net of accumulated amortization and impairment charges:

	September 30, 2023						September 30, 2022
	Gross Carrying Amount		Accumulated Amortization/ Impairment Charges		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization/ Impairment Charges		Net Carrying Amount
Finite-lived intangible assets:
Trade names	$	322.4	$	(260.7)	$	61.7	$	318.4	$	(174.3)	$	144.1
Customer relationships	251.5		(216.1)		35.4		251.1		(158.4)		92.7
Technology	50.1		(44.5)		5.6		49.1		(43.3)		5.8
Other	34.9		(24.8)		10.1		34.7		(21.0)		13.7
Total finite-lived intangible assets, net					112.8						256.3
Indefinite-lived intangible assets:
Indefinite-lived trade names					168.2						168.2
Roundup® marketing agreement amendment					155.7						155.7
Total indefinite-lived intangible assets					323.9						323.9
Total intangible assets, net					$	436.7					$	580.2

Schedule of Future Estimates of Amortization Expense

Amortization expense is estimated to be as follows for the years ending September 30:

2024	$	16.0
2025	13.3
2026	12.2
2027	11.3
2028	10.3