Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Feb. 28, 2018	Feb. 28, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 12,912	$ (525)
Other comprehensive income, net of tax:
Foreign currency translation adjustments	3,831	1,228
Unrealized (loss) gain on investments, net of tax provision of $39 and $40 for 2018 and 2017, respectively	(27)	71
Total other comprehensive income, net of tax	3,804	1,299
Comprehensive income	$ 16,716	$ 774