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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Income Taxes        
Effective income tax rate (as a percent) 17.40% 17.20% 18.00% 16.50%
Asset impairment charges     $ 12,049,000  
Tax benefit related to asset impairment charges     $ 20,000