Income Taxes - Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2014	Feb. 28, 2013
Income Tax Disclosure [Abstract]
Deferred and refundable income taxes (current)	$ 43,589	$ 54,351
Deferred and refundable income taxes (noncurrent)	70,261	91,401
Deferred income taxes and noncurrent income taxes payable	(596)	(950)
Net deferred tax assets	$ 113,254	$ 144,802