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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Income Taxes [Line Items] |  |  |  |
Effective income tax rate | (4.30%) | 27.50% | (3.90%) | 48.30%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 35.00% |
Income tax expense | $ 1.7 | $ 53.7 | $ 14.5 | $ 78.7
Increase Decrease In Fair Value Of Equity Conversion Feature Of Preferred Stock |  | $ (38.0) |  | 12.7
Increase In Valuation Allowance Due To Acquisition |  |  |  | $ 35.0
Spectrum Brands [Member] | U S Federal [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Increase In Valuation Allowance Due To Acquisition |  |  | 31.0 |
Component of Income Tax Benefit Expense, Impairments, Nonrecurring [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense |  |  | $ 12.3 |

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