Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Income Taxes [Abstract]
Unrecognized tax benefits, gross	$ 26,330,000	$ 25,059,000	$ 20,930,000	$ 18,662,000
Unrecognized tax benefits that would impact effective tax rate, if recognized	7,600,000	5,400,000	3,900,000
Increase (decrease) in accrued interest	300,000	200,000
Accrued interest	$ 1,600,000	$ 1,300,000	$ 1,100,000