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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
Income Taxes        
Effective income tax rate (as a percent) 18.20% 9.00% 16.40% 12.90%
Tax benefit recorded related to the resolution of an uncertain tax position with a foreign tax authority       $ 2,070
Asset impairment charges     $ 3,000 9,000
Tax benefit related to asset impairment charges     $ 340 $ 860