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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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