Segment Information (Capital Expenditures Relating To Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	$ 64.7	$ 77.8	$ 61.0
SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	64.7	77.8	60.7
Operating Segments [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	52.2	66.0	45.4
Operating Segments [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	52.2	66.0	45.4
Operating Segments [Member] | Hardware & Home Improvement [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	15.6	25.4	22.3
Operating Segments [Member] | Hardware & Home Improvement [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	15.6	25.4	22.3
Operating Segments [Member] | Global Pet Supplies [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	24.3	20.2	14.2
Operating Segments [Member] | Global Pet Supplies [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	24.3	20.2	14.2
Operating Segments [Member] | Home and Garden [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	6.4	6.5	6.9
Operating Segments [Member] | Home and Garden [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	6.4	6.5	6.9
Operating Segments [Member] | Global Auto Care [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	5.9	13.9	2.0
Operating Segments [Member] | Global Auto Care [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	5.9	13.9	2.0
Corporate [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	12.5	11.8	15.6
Corporate [Member] | SB/RH [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	$ 12.5	$ 11.8	$ 15.3