RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands		12 Months Ended		21 Months Ended
	Nov. 12, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) position	Nov. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Non-cash charges		$ 6,655	$ 4,692
Impairment charge, operating lease		1,968
Impairment charge, leasehold improvements		671
Personnel Related Costs
Restructuring Cost and Reserve [Line Items]
Non-cash charges		0	0
Facilities, Exit Costs and Other
Restructuring Cost and Reserve [Line Items]
Non-cash charges			0
Consumer and Professional Products
Restructuring Cost and Reserve [Line Items]
Restructuring charges		21,418	13,669	$ 35,087
Non-cash charges			4,692	$ 11,347
Impairment of inventory		4,158	304
Impairment of machinery and equipment		1,882	1,749
Impairment charge, operating lease			1,968
Impairment charge, leasehold improvements			671
Number of headcount reduced | position				400
Consumer and Professional Products | Next-generation Business Platform
Restructuring Cost and Reserve [Line Items]
Duration of project, extension	1 year
Cash charges		14,763
Non-cash charges		6,655
Impairment of inventory		6,655
Consumer and Professional Products | Next-generation Business Platform | Minimum
Restructuring Cost and Reserve [Line Items]
Effect on future cash flows, amount	$ 30,000
Restructuring and related cost, expected reduction in inventory	30,000
Consumer and Professional Products | Next-generation Business Platform | Maximum
Restructuring Cost and Reserve [Line Items]
Effect on future cash flows, amount	35,000
Restructuring and related cost, expected reduction in inventory	35,000
Consumer and Professional Products | Employee Severance and Facility Closing
Restructuring Cost and Reserve [Line Items]
Cash charges			8,977	$ 23,740
Consumer and Professional Products | Employee Severance and Facility Closing | Next-generation Business Platform
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost	46,000
Consumer and Professional Products | Personnel Related Costs
Restructuring Cost and Reserve [Line Items]
Cash charges			5,620	8,810
Consumer and Professional Products | Personnel Related Costs | Next-generation Business Platform
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost	26,000
Cash charges		3,190
Consumer and Professional Products | Facilities, Exit Costs and Other
Restructuring Cost and Reserve [Line Items]
Cash charges			$ 3,357
Consumer and Professional Products | Facilities, Exit Costs and Other | Next-generation Business Platform
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost	20,000
Cash charges		$ 11,573		$ 14,930
Consumer and Professional Products | One Time Charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost					$ 65,000
Consumer and Professional Products | One Time Charges | Next-generation Business Platform
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost	65,000
Consumer and Professional Products | Capital Investments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost					65,000
Consumer and Professional Products | Capital Investments | Next-generation Business Platform
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost	65,000
Consumer and Professional Products | Asset Write-Downs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost					$ 19,000
Consumer and Professional Products | Asset Write-Downs | Next-generation Business Platform
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost	$ 19,000