Segment Information (Schedule Of Segment Information) (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA	$ 102.0	$ 283.0	$ 334.9
Corporate expenses	36.3	39.3	31.9
Interest expense	264.6	309.9	334.5
Depreciation and amortization	131.7	132.2	120.4
Share based compensation	11.8	52.9	70.8
Acquisition and integration related charges	14.3	15.6	34.1
Restructuring and related charges	92.8	60.4	14.0
Write-off from impairment of intangible assets	20.3	16.3	2.7
Write-off from impairment of goodwill	92.5		10.7
Inventory acquisition step-up	0.8	3.3
Pet safety recall	18.9	35.8
Spectrum merger related transaction charges	45.9	7.6
Non-recurring HRG operating costs	18.9	31.9	72.5
Salus	1.1	4.0	(17.4)
Venezuela devaluation		0.4
Other	4.6		0.7
Income (loss) from operations before income taxes	(156.3)	(31.1)	9.2
Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA	598.2	678.5	673.4
Depreciation and amortization	117.4	120.1	110.8
SB/RH [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
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Corporate expenses	37.2	38.5	31.4
Interest expense	167.6	161.3	182.0
Depreciation and amortization	131.0	131.6	119.7
Share based compensation	8.7	44.9	52.1
Acquisition and integration related charges	14.3	15.6	34.1
Restructuring and related charges	92.8	60.4	14.0
Write-off from impairment of intangible assets	20.3	16.3	2.7
Write-off from impairment of goodwill	92.5
Inventory acquisition step-up	0.8	3.3
Pet safety recall	18.9	35.8
Venezuela devaluation		0.4
Other	4.6		0.7
Income (loss) from operations before income taxes	9.5	170.4	236.7
SB/RH [Member] \| Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA	598.2	678.5	673.4
Depreciation and amortization	117.4	120.1	110.8
Hardware & Home Improvement [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and related charges	52.8	26.6	2.3
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	254.7	254.4	241.6
Depreciation and amortization	40.0	38.3	35.4
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	254.7	254.4	241.6
Depreciation and amortization	40.0	38.3	35.4
Global Pet Supplies [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and related charges	13.2	9.1	6.0
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	136.7	142.7	140.1
Depreciation and amortization	42.3	43.1	42.7
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	136.7	142.7	140.1
Depreciation and amortization	42.3	43.1	42.7
Home and Garden [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and related charges	0.8		0.4
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	107.5	133.0	138.3
Depreciation and amortization	18.8	17.6	15.2
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	107.5	133.0	138.3
Depreciation and amortization	18.8	17.6	15.2
Global Auto Care [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring and related charges	18.5	24.2	5.3
Write-off from impairment of goodwill	92.5
Global Auto Care [Member] \| Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment Adjusted EBITDA	99.3	148.4	153.4
Depreciation and amortization	16.3	21.1	17.5
Global Auto Care [Member] \| SB/RH [Member] \| Operating Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
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