Stock-based Compensation (Details 1) (Stock Appreciation Rights SARS and Stock Option [Member], USD $)	3 Months Ended
	May 31, 2014
Stock Appreciation Rights SARS and Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments, Number of Shares [Roll Forward]
Outstanding as of February 28, 2013 (shares)	396,174
Granted (shares)	120,266
Exercised (shares)	(81,049)
Forfeited (shares)	(4,590)
Outstanding as of May 31, 2013 (shares)	430,801
Exercisable as of May 31, 2013	213,317
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding as of February 28, 2013, Weighted Average Exercise Price (usd per share)	$ 26.64
Granted, Weighted Average Exercise Price (usd per share)	$ 43.92
Exercised, Weighted Average Exercise Price (usd per share)	$ 22.61
Forfeited, Weighted Average Exercise Price (usd per share)	$ 41.50
Outstanding at end of the period ended May 31, 2013, Weighted Average Exercise Price (usd per share)	$ 32.06
Exercisable at end of period ended May 31, 2013, Weighted Average Exercise Price (usd per share)	$ 21.35
Weighted average fair value of options and SARs granted during the period ended May 31, 2013 (usd per share)	$ 43.92