Divestitures (Summary Of Components Of Income From Discontinued Operations Before Income Taxes) (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 02, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) Income from discontinued operations before income taxes		$ 859.2	$ 466.3	$ 466.1
Global Battery And Lighting [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Write-down of assets of business held for sale to fair value less cost to sell		0.0
Gain on sale	$ 989.8
Global Auto Care [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Write-down of assets of business held for sale to fair value less cost to sell		111.0
Discontinued Operations, Held-For-Sale [Member] | Global Battery And Lighting [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		249.0	870.5	865.6
Cost of goods sold		164.6	553.2	539.3
Gross profit		84.4	317.3	326.3
Operating expenses		57.0	241.0	193.6
Operating income (loss)		27.4	76.3	132.7
Interest expense		23.3	53.5	48.3
Other non-operating expense, net		0.5	1.0
Other non-operating income, net				(0.1)
Gain on sale		(989.8)
Reclassification of accumulated other comprehensive income		18.5
(Loss) Income from discontinued operations before income taxes		974.9	21.8	84.5
Discontinued Operations, Held-For-Sale [Member] | Global Auto Care [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		87.7	465.6	446.9
Cost of goods sold		52.5	284.9	233.7
Gross profit		35.2	180.7	213.2
Operating expenses		35.7	117.8	117.2
Operating income (loss)		(0.5)	62.9	96.0
Interest expense		0.7	2.1	1.4
Other non-operating expense, net		0.2	0.2	0.1
Write-down of assets of business held for sale to fair value less cost to sell		111.0	92.5
Reclassification of accumulated other comprehensive income		3.3
(Loss) Income from discontinued operations before income taxes		$ (115.7)	$ (31.9)	$ 94.5