Deferred Costs (Details) (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012	Feb. 28, 2011	Feb. 28, 2010	Feb. 28, 2009
Deferred costs and future payment commitments
Prepaid expenses and other	$ 94,071	$ 88,352
Other assets	395,397	327,311
Deferred cost assets	489,468	415,663
Other current liabilities	(45,891)	(64,116)
Other liabilities	(137,360)	(76,301)
Deferred cost liabilities	(183,251)	(140,417)
Net deferred costs	$ 306,217	$ 275,246	$ 287,965	$ 303,007