Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2011
Aug. 31, 2010
Aug. 31, 2011
Aug. 31, 2010
Income Taxes (Textuals)        
Effective tax rate 2.30% 38.80% 17.10% 44.20%
Recognition of a valuation allowance against deferred tax assets in the U.K.       $ 30.1