INCOME TAXES (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2012
INCOME TAXES [Abstract]
Deferred tax assets for Canadian income tax purposes	$ 4,000
Income tax benefit (provision)	(6,108)	29,178	(61)
Federal net operating loss carryforwards	99,000
State net operating loss carryforwards	84,000
Federal research and development tax credit carryforwards	5,100
State research and development tax credit carryforwards	4,800
Excess tax deductions from share-based payment arrangements	12,800	5,300
Unrecognized tax benefit from uncertain tax position relating to federal research and development	$ 1,000