Deferred Costs - Deferred Costs and Future Payment Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011	Feb. 28, 2010
Deferred Costs and Future Payment Commitment for Retail Supply Agreements [Line Items]
Prepaid expenses and other	$ 93,873	$ 94,071
Other assets	332,159	395,397
Deferred cost assets	426,032	489,468
Other current liabilities	(61,282)	(45,891)
Other liabilities	(92,153)	(137,360)
Deferred cost liabilities	(153,435)	(183,251)
Net deferred costs	$ 272,597	$ 306,217	$ 275,246	$ 287,965