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Segment Information (Segment Total Assets Relating To Segments) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 5,396.4 | $ 5,040.0
SB/RH [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 5,234.8 | 4,920.4
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 4,507.6 | 4,645.6
Operating Segments [Member] | SB/RH [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 4,507.6 | 4,645.6
Operating Segments [Member] | Hardware & Home Improvement [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,640.7 | 1,698.3
Operating Segments [Member] | Hardware & Home Improvement [Member] | SB/RH [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,640.7 | 1,698.3
Operating Segments [Member] | Global Pet Supplies [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,367.6 | 1,397.5
Operating Segments [Member] | Global Pet Supplies [Member] | SB/RH [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 1,367.6 | 1,397.5
Operating Segments [Member] | Home and Garden [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 528.4 | 546.7
Operating Segments [Member] | Home and Garden [Member] | SB/RH [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 528.4 | 546.7
Operating Segments [Member] | Home And Personal Care [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 970.9 | 1,003.1
Operating Segments [Member] | Home And Personal Care [Member] | SB/RH [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 970.9 | 1,003.1
Corporate [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | 888.8 | 394.4
Corporate [Member] | SB/RH [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Total assets | $ 727.2 | $ 274.8

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