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RELATED PARTIES - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
TSAs And Reverse TSAs
Related Party Transaction [Line Items]
Overall expected time period of transition	12 months
Net TSA (loss) income	$ (1,700,000)	$ (3,900,000)	$ 5,200,000
TSAs And Reverse TSAs | Energizer
Related Party Transaction [Line Items]
Related party, net receivable (payable)	(2,900,000)	5,400,000
TSAs And Reverse TSAs | Varta
Related Party Transaction [Line Items]
Related party, net receivable (payable)	$ 1,700,000	(1,000,000)
H&G Supply Agreement | Energizer
Related Party Transaction [Line Items]
Supply agreement contract term	24 months
Net TSA (loss) income	$ 6,000,000	18,900,000	$ 12,500,000
Net receivable from related party	$ 0	$ 4,400,000
Minimum | TSAs And Reverse TSAs
Related Party Transaction [Line Items]
Overall expected time period of transition	12 months
Maximum | TSAs And Reverse TSAs
Related Party Transaction [Line Items]
Overall expected time period of transition	24 months

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