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DIVESTITURES - Summary of Components of Income from Discontinued Operations, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2021	Jul. 04, 2021	Apr. 04, 2021	Jan. 03, 2021	Sep. 30, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax									$ 174.3	$ 150.9	$ 798.0
(Loss) income from discontinued operations, net of tax attributable to noncontrolling interest									(0.2)	0.4	0.5
Income from discontinued operations, net of tax attributable to controlling interest	$ 44.2	$ 32.5	$ 40.4	$ 57.4	$ 55.0	$ 19.0	$ 50.7	$ 25.8	174.5	150.5	797.5
Discontinued Operations, Held-for-sale or Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes									236.4	184.6	1,019.5
Income tax expense from discontinued operations									62.1	33.7	221.5
Income from discontinued operations, net of tax									174.3	150.9	798.0
(Loss) income from discontinued operations, net of tax attributable to noncontrolling interest									(0.2)	0.4	0.5
Income from discontinued operations, net of tax attributable to controlling interest									174.5	150.5	797.5
Discontinued Operations, Held-for-sale or Disposed of by Sale | HHI Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes									288.2	227.8	220.6
Discontinued Operations, Held-for-sale or Disposed of by Sale | Global Battery And Lighting
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes									(7.2)	4.2	997.6
Discontinued Operations, Held-for-sale or Disposed of by Sale | Global Auto Care
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes									(0.1)	(0.1)	(115.7)
Discontinued Operations, Held-for-sale or Disposed of by Sale | Corporate Debt
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes									$ 44.5	$ 47.3	$ 83.0

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