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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
Goodwill And Intangible Assets [Line Items] |  |  |
Goodwill, Purchase Accounting Adjustments | $ 0.0 |  |
Deconsolidation, Gain (Loss), Amount | 0.0 | $ 0.0 | $ 38.5
Cost | 1,423.9 | 1,387.7 |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |
Beginning Balance, Goodwill | 2,478.4 | 2,487.4 |
Beginning Balance, Indefinite Lived Intangible Assets | 1,473.5 | 1,490.3 |
Beginning Balance, Finite Lived Intangible Assets | 899.0 |  |
Beginning Balance, Intangible Assets, Excluding Goodwill | 2,372.5 | 2,480.3 |
Goodwill, Acquired During Period |  | 3.3 |
Indefinite-lived Intangible Assets Acquired |  | 1.0 |
Acquisitions (Note 13) |  | 4.2 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  | (31.9)
Impairment of Intangible Assets, Finite-lived | (16.3) | (15.4) | (60.2)
Impairment of Intangible Assets (Excluding Goodwill) | (16.3) | (4.7) |
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit |  | (9.9) |
Less: Components of amortization: |  |  |
Effect of translation, Goodwill | 12.6 | (1.6) |
Effect of translation, Indefinite Lived intangible assets |  | (13.1) |
Effect of translation, Finite Lived intangible assets | 15.7 | (13.4) |
Ending Balance, Goodwill | 2,626.0 | 2,478.4 | 2,487.4
Ending Balance, Indefinite Lived Intangible Assets | 1,548.8 | 1,473.5 | 1,490.3
Ending Balance, Finite Lived Intangible Assets | 875.2 | 899.0 |
Ending Balance, Intangible Assets, Excluding Goodwill | 2,424.0 | 2,372.5 | 2,480.3
Finite-Lived Intangible Assets, Accumulated Amortization | 548.7 | 488.7 |
Finite-Lived Intangible Assets, Period Increase (Decrease) |  | (0.9) |
Intangible Assets, Purchase Accounting Adjustments | 148.2 |  |
Periodic amortization |  |  |
Less: Components of amortization: |  |  |
Amortization of Intangible Assets | (95.2) | (93.9) |
Customer Relationships [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Cost | 1,007.6 | 984.8 |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |
Beginning Balance, Finite Lived Intangible Assets | 681.9 |  |
Less: Components of amortization: |  |  |
Amortization of Intangible Assets |  |  | (87.8)
Ending Balance, Finite Lived Intangible Assets | 646.9 | 681.9 |
Finite-Lived Intangible Assets, Accumulated Amortization | 360.7 | 302.9 |
Definite Lived Intangible Assets |  |  |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |
Beginning Balance, Finite Lived Intangible Assets | 899.0 | 990.0 |
Acquisitions (Note 3), Finite-Lived Intangible Assets |  | 3.2 |
Impairment of Intangible Assets, Finite-lived | 0.0 | 0.0 |
Less: Components of amortization: |  |  |
Amortization of Intangible Assets | (95.2) | (93.9) |
Effect of translation, Finite Lived intangible assets | 5.2 | (0.3) |
Ending Balance, Finite Lived Intangible Assets | 875.2 | 899.0 | 990.0
Finite-Lived Intangible Assets, Purchase Accounting Adjustments | 67.1 | (0.9) |
Definite Lived Intangible Assets | Periodic amortization |  |  |
Less: Components of amortization: |  |  |
Amortization of Intangible Assets | (95.2) | (93.9) |
Goodwill [Member] |  |  |
Less: Components of amortization: |  |  |
Amortization of Intangible Assets |  | 0.0 |
Trade Names [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Cost | 165.8 | 165.7 |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |
Beginning Balance, Finite Lived Intangible Assets | 76.6 |  |
Less: Components of amortization: |  |  |
Ending Balance, Finite Lived Intangible Assets | 61.2 | 76.6 |
Finite-Lived Intangible Assets, Accumulated Amortization | 104.6 | 89.1 |
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) | $ (4.7) |
Indefinite Lived Intangible Assets Excluding Goodwill [Member] |  |  |
Less: Components of amortization: |  |  |
Effect of translation, Indefinite Lived intangible assets | 10.5 |  |
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments | $ 81.1 |  |

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