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Income Taxes (Details) (USD $)
3 Months Ended 9 Months Ended
Nov. 30, 2013
May 31, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
Income Taxes          
Effective income tax rate (as a percent) 20.00%   13.90% 19.00% 15.30%
Asset impairment charges   $ 12,049,000   $ 12,049,000  
Tax benefit related to asset impairment charges   $ 20,000