Segment Information (Schedule Of Segment Information) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		$ 72.2	$ 224.2	$ 287.5
Corporate expenses		22.0	36.3	39.3
Interest expense		222.1	264.0	310.4
Depreciation and amortization		180.8	125.3	147.3
Share and incentive based compensation		53.7	11.9	54.2
Restructuring and related charges		65.7	75.6	37.5
Transaction related charges		21.8	30.2	17.7
Write-off from impairment of goodwill		116.0
Write-off from impairment of intangible assets		35.4	20.3	16.3
Unrealized loss on Energizer investment		12.1
Foreign currency loss on multicurrency divestiture loans		36.2
Legal and environmental remediation reserves		10.0
Inventory acquisition step-up			0.8	3.3
GPC safety recall		0.7	18.9	35.8
Spectrum merger related transaction charges			45.9	7.6
Non-recurring HRG operating costs			18.9	32.1
Salus		1.6	1.1	4.0
Other		4.7	4.8	0.3
Loss from operations before income taxes		(193.8)	(35.7)	(27.9)
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		589.0	618.3	677.9
Depreciation and amortization		166.2	109.9	133.8
SB/RH [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		77.0	302.3	341.2
Corporate expenses		20.7	35.9	38.6
Interest expense		162.0	167.0	161.8
Depreciation and amortization		180.8	124.6	146.8
Share and incentive based compensation		52.1	8.8	46.2
Restructuring and related charges		65.7	75.6	37.5
Transaction related charges		21.8	30.2	17.7
Write-off from impairment of goodwill		116.0
Write-off from impairment of intangible assets		35.4	20.3	16.3
Unrealized loss on Energizer investment		12.1
Foreign currency loss on multicurrency divestiture loans		36.2
Legal and environmental remediation reserves		10.0
Inventory acquisition step-up			0.8	3.3
GPC safety recall		0.7	18.9	35.8
Other		4.7	6.1	0.3
Loss from operations before income taxes		(129.2)	130.1	173.6
SB/RH [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		589.0	618.3	677.9
Depreciation and amortization		166.2	109.9	133.8
Hardware & Home Improvement [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and related charges		4.7
Write-off from impairment of goodwill
Hardware & Home Improvement [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		253.7	254.7	254.4
Depreciation and amortization		33.5	40.0	38.3
Hardware & Home Improvement [Member] | SB/RH [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		253.7	254.7	254.4
Depreciation and amortization		33.5	40.0	38.3
Home And Personal Care [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and related charges		8.1
Write-off from impairment of goodwill	$ 116.0	116.0
Home And Personal Care [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		87.2	119.4	147.8
Depreciation and amortization		64.6	8.8	34.8
Home And Personal Care [Member] | SB/RH [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		87.2	119.4	147.8
Depreciation and amortization		64.6	8.8	34.8
Global Pet Supplies [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and related charges		7.6
Write-off from impairment of goodwill
Global Pet Supplies [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		142.6	136.7	142.7
Depreciation and amortization		48.8	42.3	43.1
Global Pet Supplies [Member] | SB/RH [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		142.6	136.7	142.7
Depreciation and amortization		48.8	42.3	43.1
Home And Garden [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and related charges		1.8
Write-off from impairment of goodwill
Home And Garden [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		105.5	107.5	133.0
Depreciation and amortization		19.3	18.8	17.6
Home And Garden [Member] | SB/RH [Member] | Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA		105.5	107.5	133.0
Depreciation and amortization		$ 19.3	$ 18.8	$ 17.6