Income Taxes - Company's Total Gross Unrecognized Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Schedule of Company's total gross unrecognized benefits
Balance at beginning of year	$ 30,360	$ 43,323	$ 45,661
Additions based on tax positions related to current year		270	2,177
Additions for tax positions of prior years	2,106	5,404	1,239
Reductions for tax positions of prior years	(184)	(8,959)	(2,405)
Settlements	(9,122)	(9,444)	(2,972)
Statute lapse	(1,501)	(234)	(377)
Balance at end of year	$ 21,659	$ 30,360	$ 43,323