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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2016
May 31, 2016
Aug. 31, 2015
Aug. 31, 2016
Aug. 31, 2015
Income Taxes          
Effective income tax rate (as a percent) 15.90%   18.20% 10.80% 16.40%
Tax benefit recorded related to the resolution of an uncertain tax position   $ 1,400      
Tax benefit recorded related to the recognition of excess tax benefits from share-based compensation $ 230     $ 1,340