Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	May 31, 2014	May 31, 2013
Net income	$ 37,745	$ 40,391
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(902)	(3,617)
Available-for-sale securities:
Unrealized gain (loss) on available-for-sale securities during the period	89	(731)
Reclassification for gain realized on available-for-sale securities, reported in Other income (expense), net	(153)	(285)
Tax benefit	67	372
Net change in available-for-sale securities (net of tax)	3	(644)
Total other comprehensive loss	(899)	(4,261)
Comprehensive income	$ 36,846	$ 36,130