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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