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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Income Taxes [Line Items]        
Effective income tax rate 43.40% 0.30% 16.60% (1.40%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00%  
Income tax expense (benefit) $ 8.9 $ (0.8) $ 10.8 $ 5.2
Component of Income Tax Benefit Expense, Impairments, Nonrecurring [Member]        
Income Taxes [Line Items]        
Income tax expense (benefit)       $ 12.3
Spectrum Brands [Member]        
Income Taxes [Line Items]        
Operating Loss Carryforwards 88.0   88.0  
Unrecognized Tax Benefits $ 209.0   209.0  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ 84.0