Segment Information (Depreciation And Amortization Relating To Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	$ 180.8	$ 125.3	$ 147.3
SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	180.8	124.6	146.8
Operating Segments [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	166.2	109.9	133.8
Operating Segments [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	166.2	109.9	133.8
Operating Segments [Member] | Hardware & Home Improvement [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	33.5	40.0	38.3
Operating Segments [Member] | Hardware & Home Improvement [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	33.5	40.0	38.3
Operating Segments [Member] | Global Pet Supplies [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	48.8	42.3	43.1
Operating Segments [Member] | Global Pet Supplies [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	48.8	42.3	43.1
Operating Segments [Member] | Home And Garden [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	19.3	18.8	17.6
Operating Segments [Member] | Home And Garden [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	19.3	18.8	17.6
Operating Segments [Member] | Home And Personal Care [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	64.6	8.8	34.8
Operating Segments [Member] | Home And Personal Care [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	64.6	8.8	34.8
Corporate [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	14.6	15.4	13.5
Corporate [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total depreciation and amortization	$ 14.6	$ 14.7	$ 13.0