Stock-based Compensation (Details 1) (Stock Appreciation Rights SARS and Stock Option [Member], USD $)	3 Months Ended
	May 31, 2013
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)	439,863
Granted (shares)	71,622
Exercised (shares)	(111,371)
Forfeited (shares)	0
Outstanding as of May 31, 2013 (shares)	400,114
Exercisable as of May 31, 2013	195,937
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)	$ 19.12
Granted, Weighted Average Exercise Price (usd per share)	$ 45.36
Exercised, Weighted Average Exercise Price (usd per share)	$ 19.45
Forfeited, Weighted Average Exercise Price (usd per share)	$ 0.00
Outstanding at end of the period ended May 31, 2013, Weighted Average Exercise Price (usd per share)	$ 23.75
Exercisable at end of period ended May 31, 2013, Weighted Average Exercise Price (usd per share)	$ 15.85
Weighted average fair value of options and SARs granted during the period ended May 31, 2013 (usd per share)	$ 14.15