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Income Taxes (Details) (USD $)
3 Months Ended
May 31, 2014
May 31, 2013
Income Taxes    
Effective income tax rate (as a percent) 17.00% 19.00%
Asset impairment charges $ 9,000,000 $ 12,049,000
Tax benefit related to asset impairment charges $ 860,000 $ 20,000