Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 5,769	$ 12,799	$ 4,798	$ 23,899
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(2,672)	989	(8,154)	1,138
Unrealized (losses) gains on investments, net of tax of $0 for the second quarter and first six months of 2015, and $28 and $159 for the second quarter and first six months of 2014, respectively	(33)	(118)	(35)	107
Total other comprehensive (loss) income, net of tax	(2,705)	871	(8,189)	1,245
Comprehensive income (loss)	$ 3,064	$ 13,670	$ (3,391)	$ 25,144