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Goodwill and Intangibles, net - Additional Information (Detail) - 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 (Excluding Goodwill) | $ 1,548.8 | $ 1,473.5 | $ 1,490.3
Document Period End Date | Sep. 30, 2017 |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | 31.9
Deconsolidation, Gain (Loss), Amount | $ 0.0 | 0.0 | 38.5
Goodwill, Acquired During Period |  | 3.3 |
Finite-Lived Intangible Assets, Accumulated Amortization | 548.7 | 488.7 |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 91.0 |  |
VOBA |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 90.9 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 88.5 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 79.7 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 69.2 |  |
Spectrum Brands [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 16.3 | $ 4.7 |
FOH [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | $ 16.2
Global Auto Care [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 12.40% |  |
Global batteries and appliances [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount | 152.10% |  |
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% |  |

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