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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Goodwill and Intangibles (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit |  | $ 9.9 |
Deconsolidation, Gain (Loss), Amount | $ 0.0 | 0.0 | $ 38.5
Document Period End Date | Sep. 30, 2017 |  |
Funds Withheld Receivable |  | 0.0 |
Goodwill, Purchase Accounting Adjustments | $ 0.0 |  |
Goodwill, Acquired During Period |  | 3.3 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | 31.9
Customer Relationships [Member] | Weighted average |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period, intangible asset | 17 years 11 months |  |
Customer Relationships [Member] | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period, intangible asset | 20 years |  |
Technology Assets [Member] | Weighted average |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period, intangible asset | 11 years 4 months 12 days |  |
Technology Assets [Member] | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period, intangible asset | 18 years |  |
Trade Names [Member] | Weighted average |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period, intangible asset | 6 years 2 months |  |
Hardware and home improvement [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 93.20% |  |
Global Pet Supplies [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 38.60% |  |
Home and Garden [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 352.30% |  |
Spectrum Brands [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 16.3 | 2.7 |
FOH [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 16.2
FOH [Member] | Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived Intangible Assets Acquired |  |  | 9.9
Goodwill, Acquired During Period |  |  | 16.2
CorAmerica [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill and Intangible Asset Impairment |  | $ 10.7 | $ 28.3

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