Stock-based Compensation (Details 1) - May. 31, 2015 - Stock Appreciation Rights (SARs) [Member] - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Number of Shares [Roll Forward]
Outstanding as of February 28, 2015	376,982
Granted (shares)	0
Exercised (shares)	(5,128)
Forfeited (shares)	(4,078)
Outstanding as of May 31, 2015	367,776
Exercisable as of May 31, 2015	258,856
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding as of February 28, 2015	$ 31.27
Granted, Weighted Average Exercise Price (usd per share)	0.00
Exercised, Weighted Average Exercise Price (usd per share)	23.69
Forfeited, Weighted Average Exercise Price (usd per share)	44.42
Outstanding as of May 31, 2015	31.23
Exercisable as of May 31, 2015	$ 25.69