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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Income Taxes [Line Items]            
Effective income tax rate (7.90%)   20.80%   (8.70%) 6.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent         35.00%  
Excess Tax Benefit from Share-based Compensation, Financing Activities $ (11.6)       $ (29.0)  
Income tax benefit (8.4) $ (8.5) $ (37.8) $ (6.6) (15.0) $ (32.6)
Component of Income Tax Benefit Expense, Impairments, Nonrecurring [Member]            
Income Taxes [Line Items]            
Income tax benefit           12.3
Spectrum Brands [Member]            
Income Taxes [Line Items]            
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount         5.9  
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount         25.5  
Operating Loss Carryforwards 88.0       88.0  
Unrecognized Tax Benefits 211.0       211.0  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount         95.0  
Income tax benefit         14.0 $ 31.0
Adjustments for New Accounting Principle, Early Adoption [Member] | Spectrum Brands [Member]            
Income Taxes [Line Items]            
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 25.0       $ 109.0