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SIGNIFICANT ACCOUNTING POLICIES AND PRACTICES - Summary of Transactions Related Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Total transaction-related charges	$ 56.3	$ 23.1	$ 20.9
HHI divestiture and separation
Business Acquisition [Line Items]
Total transaction-related charges	9.6	0.0	0.0
Rejuvenate acquisition
Business Acquisition [Line Items]
Total transaction-related charges	10.8	0.0	0.0
Armitage acquisition
Business Acquisition [Line Items]
Total transaction-related charges	10.9	0.0	0.0
Coevorden operations divestiture and separation
Business Acquisition [Line Items]
Total transaction-related charges	5.4	5.5	0.0
GBL divestiture and separation
Business Acquisition [Line Items]
Total transaction-related charges	3.2	10.2	9.5
PetMatrix integration
Business Acquisition [Line Items]
Total transaction-related charges	0.0	0.0	0.0
Omega Sea acquisition
Business Acquisition [Line Items]
Total transaction-related charges	0.2	1.6	0.0
Other
Business Acquisition [Line Items]
Total transaction-related charges	$ 16.2	$ 5.8	$ 11.4

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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