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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended
May. 31, 2015
May. 31, 2014
Income Taxes    
Effective income tax rate (as a percent) 14.20% 17.00%
Asset impairment charges $ 3,000 $ 9,000
Tax benefit related to asset impairment charges $ 340 $ 860