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Goodwill and Intangibles, net - Summary of Changes in Carrying Amounts of Goodwill and Intangible Assets (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2017 | Sep. 30, 2016
Goodwill And Intangible Assets [Line Items] |  |  |  |  |
Goodwill, Purchase Accounting Adjustments | $ 0.0 |  |  |  |
Deconsolidation, Gain (Loss), Amount | 0.0 | $ 0.0 | $ 38.5 |  |
Cost |  |  |  | $ 884.8 | $ 853.0
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance, Goodwill | 2,133.3 | 2,138.9 |  |  |
Beginning Balance, Indefinite Lived Intangible Assets | 953.9 | 957.6 |  |  |
Beginning Balance, Finite Lived Intangible Assets | 580.9 |  |  |  |
Intangibles, net (Note 11) | 1,612.0 | 1,534.8 | 1,595.3 | 1,612.0 | 1,534.8
Goodwill, Acquired During Period |  | 3.3 |  |  |
Acquisitions (Note 13) | 148.2 | 3.2 |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | (31.9) |  |
Impairment of Intangible Assets, Finite-lived | (16.3) | (13.4) | (60.2) |  |
Impairment of Intangible Assets (Excluding Goodwill) | (16.3) | (2.7) |  |  |
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit |  | (9.9) |  |  |
Less: Components of amortization: |  |  |  |  |
Effect of translation, Goodwill | 8.8 | 1.8 |  |  |
Effect of translation, Indefinite Lived intangible assets |  | (1.0) |  |  |
Effect of translation, Finite Lived intangible assets | 8.2 | (0.4) |  |  |
Ending Balance, Goodwill | 2,277.1 | 2,133.3 | 2,138.9 |  |
Ending Balance, Indefinite Lived Intangible Assets | 1,024.3 | 953.9 | 957.6 |  |
Ending Balance, Finite Lived Intangible Assets | 587.7 | 580.9 |  |  |
Ending Balance, Intangible Assets, Excluding Goodwill | 1,612.0 | 1,534.8 | 1,595.3 |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | 297.1 | 272.1
Finite-Lived Intangible Assets, Period Increase (Decrease) | (0.9) |  |  |  |
Periodic amortization |  |  |  |  |
Less: Components of amortization: |  |  |  |  |
Amortization of Intangible Assets | (62.0) | (60.6) |  |  |
Customer Relationships [Member] |  |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |  |
Cost |  |  |  | 671.7 | 653.4
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance, Finite Lived Intangible Assets | 469.9 |  |  |  |
Less: Components of amortization: |  |  |  |  |
Amortization of Intangible Assets |  |  | (53.8) |  |
Ending Balance, Finite Lived Intangible Assets | 449.4 | 469.9 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | 222.3 | 183.5
Definite Lived Intangible Assets |  |  |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance, Finite Lived Intangible Assets | 580.9 | 637.7 |  |  |
Acquisitions (Note 3), Finite-Lived Intangible Assets | 67.1 | 3.2 |  |  |
Impairment of Intangible Assets, Finite-lived | 0.0 | 0.0 |  |  |
Less: Components of amortization: |  |  |  |  |
Amortization of Intangible Assets | (62.0) | (60.6) |  |  |
Effect of translation, Finite Lived intangible assets | 2.6 | 0.6 |  |  |
Ending Balance, Finite Lived Intangible Assets | 587.7 | 580.9 | 637.7 |  |
Finite-Lived Intangible Assets, Purchase Accounting Adjustments | (0.9) |  |  |  |
Definite Lived Intangible Assets | Periodic amortization |  |  |  |  |
Less: Components of amortization: |  |  |  |  |
Amortization of Intangible Assets | (62.0) | (60.6) |  |  |
Goodwill [Member] |  |  |  |  |
Less: Components of amortization: |  |  |  |  |
Amortization of Intangible Assets |  | 0.0 |  |  |
Trade Names [Member] |  |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |  |
Cost |  |  |  | 18.5 | 18.3
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |  |
Beginning Balance, Finite Lived Intangible Assets | 6.5 |  |  |  |
Less: Components of amortization: |  |  |  |  |
Ending Balance, Finite Lived Intangible Assets | 3.4 | 6.5 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | $ 15.1 | $ 11.8
CorAmerica [Member] |  |  |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |  |
Goodwill and Intangible Asset Impairment |  | (10.7) | $ (28.3) |  |
Spectrum Brands [Member] |  |  |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | (16.3) | $ (2.7) |  |  |
Indefinite Lived Intangible Assets Excluding Goodwill [Member] |  |  |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |  |
Indefinite-lived Intangible Assets Acquired | 81.1 |  |  |  |
Less: Components of amortization: |  |  |  |  |
Effect of translation, Indefinite Lived intangible assets | 5.6 |  |  |  |
Accounting Standards Update 2015-16 [Member] | Goodwill [Member] |  |  |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Acquired During Period | $ 135.0 |  |  |  |

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