Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 28, 2010
Schedule of Company's total gross unrecognized benefits
Balance at beginning of year	$ 43,323	$ 45,661	$ 34,760
Additions based on tax positions related to current year	270	2,177	12,673
Additions for tax positions of prior years	5,404	1,239	4,656
Reductions for tax positions of prior years	(8,959)	(2,405)	(6,345)
Settlements	(9,444)	(2,972)	(83)
Statute lapse	(234)	(377)	0
Balance at end of year	$ 30,360	$ 43,323	$ 45,661