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INCOME TAXES - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2017
Income Taxes [Line Items]
Federal statutory rate		21.00%
Income tax benefit, GILTI		$ 11,400,000	$ 4,400,000
Income tax benefit		26,400,000	(27,300,000)	$ 52,000,000.0
U.S. net operating losses				454,600,000
Federal and state tax expense				95,900,000
Income tax expense for one-time deemed mandatory repatriation				(48,000,000)
Foreign tax credits				70,700,000
Repatriation tax liability	$ 18,900,000	$ 18,900,000			$ 25,100,000
Mandatory repatriation tax payable period		8 years
Repatriation tax liability due and payable in the next 12 months, will be offset	2,000,000	$ 2,000,000
Goodwill impairment related to tax expense		0	2,800,000	12,200,000
Impairment of goodwill		0	0	116,000,000.0
Residual foreign taxes on undistributed foreign earnings	1,800,000	1,800,000	1,400,000
Undistributed foreign earnings were taxed in the U.S.		500,600,000
Tax reform act, income tax expense (benefit)		23,400,000
Undistributed foreign earnings, high-tax exceptions		23,200,000
Undistributed foreign earnings, taxed		62,100,000
U.S. federal net operating loss carryforwards	1,389,300,000	1,389,300,000
Federal tax benefit		(3,000,000.0)	(300,000)	47,600,000
U.S. state net operating loss carryforwards	69,600,000	69,600,000
Foreign operating loss carryforwards	398,000,000	398,000,000
Current income tax benefit		(32,600,000)	(2,200,000)	(29,200,000)
Foreign operating loss carryforwards, additional loss	324,200,000	324,200,000
Deferred tax assets, valuation allowance	349,400,000	349,400,000	302,500,000	302,700,000
(Decrease) increase in valuation allowance, deferred tax asset		46,900,000	(200,000)
Unrecognized tax benefits that would impact effective tax rate	18,000,000	18,000,000	13,800,000
Unrecognized tax benefits, income tax penalties and interest accrued	1,500,000	1,500,000	1,500,000
Change in unrecognized tax benefits, income tax penalties and interest expense			(1,000,000)	200,000
HHI Segment
Income Taxes [Line Items]
Income tax benefit, GILTI	5,800,000
Income tax benefit		6,700,000
(Decrease) increase in valuation allowance, deferred tax asset		29,200,000
Research Tax Credit Carryforward
Income Taxes [Line Items]
Tax credit carryforward			27,400,000
Research Tax Credit Carryforward, Expiring In Fiscal Years 2023-2030
Income Taxes [Line Items]
Tax credit carryforward	400,000	400,000
Federal Net Operating Losses
Income Taxes [Line Items]
Federal tax benefit		291,700,000
U.S. federal operating loss carryforwards expected to expire unused	660,500,000	660,500,000
Tax benefit related to NOLs expire unused	138,700,000	138,700,000
Release of valuation allowance				36,700,000
Foreign Net Operating Losses
Income Taxes [Line Items]
Current income tax benefit		97,700,000
Tax benefit related to NOLs expire unused	96,100,000	96,100,000
U.S. State Net Operating Losses
Income Taxes [Line Items]
Tax benefit related to NOLs expire unused	10,000,000	10,000,000
Deferred tax assets, valuation allowance	39,200,000	39,200,000
U.S. Net Deferred Tax Assets
Income Taxes [Line Items]
Deferred tax assets, valuation allowance	253,000,000	253,000,000	283,600,000	273,500,000
(Decrease) increase in valuation allowance, deferred tax asset		(30,600,000)	10,100,000
Foreign Net Deferred Tax Assets
Income Taxes [Line Items]
Deferred tax assets, valuation allowance	96,400,000	96,400,000	18,900,000	29,200,000
(Decrease) increase in valuation allowance, deferred tax asset		77,500,000	(10,300,000)
SB/RH
Income Taxes [Line Items]
Income tax benefit		25,000,000.0	(14,500,000)	36,100,000
Goodwill impairment related to tax expense		0	2,800,000	12,200,000
Impairment of goodwill		0	0	116,000,000.0
Residual foreign taxes on undistributed foreign earnings	1,800,000	1,800,000	1,400,000
Federal tax benefit		(3,000,000.0)	(300,000)	47,600,000
Current income tax benefit		(32,600,000)	(2,200,000)	$ (29,200,000)
Deferred tax assets, valuation allowance	245,100,000	245,100,000	$ 198,200,000
Income taxes payable	$ 8,000,000	$ 8,000,000

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