Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,437	$ (2,239)	$ 5,221	$ (6,071)
Other comprehensive income (loss), net of tax:
Change in net foreign currency translation adjustment	(708)	375	(374)	324
Available-for-sale investments:
Change in net unrealized gains (losses) (net of tax effect of $0, $0, $0 and $0)	(240)	(733)	370	1,122
Less: reclassification adjustment for net gains (losses) included in net income (loss) (net of tax effect of $247, $0, $394 and $1)	(459)	1	(732)	(2)
Net change	(699)	(732)	(362)	1,120
Other comprehensive income (loss)	(1,407)	(357)	(736)	1,444
Comprehensive income (loss)	$ 1,030	$ (2,596)	$ 4,485	$ (4,627)