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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |  |  |
Federal statutory rate |  | 21.00% |  |  |
Income tax benefit |  | $ 13.3 | $ 26.4 | $ (27.3) |
Income tax benefit, GILTI |  |  | 4.4 |  |
Repatriation tax liability |  | $ 16.9 |  |  | $ 25.1
Mandatory repatriation tax payable period |  | 8 years |  |  |
Repatriation tax liability due and payable in the next 12 months, will be offset |  | $ 2.2 |  |  |
Goodwill impairment related to tax expense |  | 0.0 | 0.0 | 2.8 |
Residual foreign taxes on undistributed foreign earnings | $ 1.8 | 2.0 | 1.8 |  |
Undistributed foreign earnings were taxed in the U.S. |  | 500.6 |  |  |
Tax reform act, income tax expense (benefit) |  | 78.5 |  |  |
Undistributed foreign earnings, high-tax exceptions |  | 13.0 |  |  |
Undistributed foreign earnings, taxed |  | 75.2 |  |  |
U.S. federal net operating loss carryforwards |  | 1,382.3 |  |  |
Federal tax benefit |  | (7.7) | (3.0) | (0.3) |
U.S. state net operating loss carryforwards |  | 77.8 |  |  |
Foreign operating loss carryforwards |  | 340.7 |  |  |
Current income tax benefit |  | (24.7) | (32.6) | (2.2) |
Foreign operating loss carryforwards, additional loss |  | 324.2 |  |  |
Deferred tax assets, valuation allowance | 349.4 | 337.4 | 349.4 | 302.5 |
Increase (decrease) in valuation allowance, deferred tax asset |  | (12.0) | 46.9 |  |
Unrecognized tax benefits that would impact effective tax rate | 18.0 | 100.9 | 18.0 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 1.5 | 1.4 | 1.5 |  |
Decrease in unrecognized tax benefits, income tax penalties and interest expense |  | 0.1 |  |  |
Gross increase – tax positions in prior period |  | 84.4 | 4.1 | 1.0 |
June 2019 Regulations |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Gross increase – tax positions in prior period |  | 67.3 |  |  |
November 2020 Regulations |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax benefit |  | 3.2 | 11.4 |  |
HHI Segment |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax benefit |  |  | 6.7 |  |
Income tax benefit, GILTI | 5.8 |  |  |  |
Increase (decrease) in valuation allowance, deferred tax asset |  | (29.2) |  |  |
Research Tax Credit Carryforward |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax credit carryforward | 30.0 |  | 30.0 |  |
Research Tax Credit Carryforward, Expiring In Fiscal Years 2023-2030 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax credit carryforward |  | 0.4 |  |  |
Federal Net Operating Losses |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Federal tax benefit |  | 290.3 |  |  |
U.S. federal operating loss carryforwards expected to expire unused |  | 640.9 |  |  |
Tax benefit related to NOLs expire unused |  | 134.6 |  |  |
Foreign Net Operating Losses |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Current income tax benefit |  | 83.1 |  |  |
Tax benefit related to NOLs expire unused |  | 79.5 |  |  |
U.S. State Net Operating Losses |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax benefit related to NOLs expire unused |  | 19.4 |  |  |
Deferred tax assets, valuation allowance |  | 46.2 |  |  |
U.S. Net Deferred Tax Assets |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred tax assets, valuation allowance | 253.0 | 257.5 | 253.0 | 283.6 |
Increase (decrease) in valuation allowance, deferred tax asset |  | 4.5 | (30.6) |  |
Foreign Net Deferred Tax Assets |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred tax assets, valuation allowance | 96.4 | 79.9 | 96.4 | 18.9 |
Increase (decrease) in valuation allowance, deferred tax asset |  | (16.5) | 77.5 |  |
SB/RH |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax benefit |  | 12.9 | 25.0 | (14.5) |
Goodwill impairment related to tax expense |  | 0.0 | 0.0 | 2.8 |
Residual foreign taxes on undistributed foreign earnings | 1.8 | 2.0 | 1.8 |  |
Federal tax benefit |  | (7.7) | (3.0) | (0.3) |
Current income tax benefit |  | (24.7) | (32.6) | $ (2.2) |
Deferred tax assets, valuation allowance | $ 245.1 | 233.7 | $ 245.1 |  |
Income taxes payable |  | $ 2.7 |  |  |

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