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Segment Information (Depreciation And Amortization 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 depreciation and amortization $ 131.7 $ 132.2 $ 120.4
SB/RH [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 131.0 131.6 119.7
Operating Segments [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 117.4 120.1 110.8
Operating Segments [Member] | SB/RH [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 117.4 120.1 110.8
Operating Segments [Member] | Hardware & Home Improvement [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 40.0 38.3 35.4
Operating Segments [Member] | Hardware & Home Improvement [Member] | SB/RH [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 40.0 38.3 35.4
Operating Segments [Member] | Global Pet Supplies [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 42.3 43.1 42.7
Operating Segments [Member] | Global Pet Supplies [Member] | SB/RH [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 42.3 43.1 42.7
Operating Segments [Member] | Home and Garden [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 18.8 17.6 15.2
Operating Segments [Member] | Home and Garden [Member] | SB/RH [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 18.8 17.6 15.2
Operating Segments [Member] | Global Auto Care [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 16.3 21.1 17.5
Operating Segments [Member] | Global Auto Care [Member] | SB/RH [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 16.3 21.1 17.5
Corporate [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization 14.3 12.1 9.6
Corporate [Member] | SB/RH [Member]      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total depreciation and amortization $ 13.6 $ 11.5 $ 8.9