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Income Taxes Income Tax (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Income Tax Disclosure [Abstract]        
Deferred Tax Assets, Net (in usd) $ 181.6   $ 181.6  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate (in usd) 192.3   192.3  
Unrecognized Tax Benefits (in usd) 206.0   206.0  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 35.00%      
Effective tax rate excluding the impact of discrete tax items 25.00%      
Effective Income Tax Rate, Continuing Operations 30.00% 24.00% 24.00% 21.00%
Discrete Tax Items $ 2.7   $ 3.6  
Effective Tax Rate - Increase/Decrease in the effective tax rate 6.00%   3.00%