Segment Information (Capital Expenditures 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 capital expenditures	$ 58.4	$ 75.9	$ 81.8
SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	58.4	75.9	81.8
Operating Segments [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	50.9	61.4	67.5
Operating Segments [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	50.9	61.4	67.5
Operating Segments [Member] | Hardware & Home Improvement [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	18.0	15.6	25.5
Operating Segments [Member] | Hardware & Home Improvement [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	18.0	15.6	25.5
Operating Segments [Member] | Global Pet Supplies [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	16.0	24.6	20.2
Operating Segments [Member] | Global Pet Supplies [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	16.0	24.6	20.2
Operating Segments [Member] | Home And Garden [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	5.9	6.4	6.5
Operating Segments [Member] | Home And Garden [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	5.9	6.4	6.5
Operating Segments [Member] | Home And Personal Care [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	11.0	14.8	15.3
Operating Segments [Member] | Home And Personal Care [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	11.0	14.8	15.3
Corporate [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	7.5	14.5	14.3
Corporate [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	$ 7.5	$ 14.5	$ 14.3