Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 16,746	$ 11,172	$ 45,061	$ 20,988
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(1,950)	5,920	(7,137)	11,291
Unrealized gains on investments, net of tax provision of $18 and $57 for the third quarter and first nine months of 2018, respectively and $17 and $62 for the third quarter and first nine months of 2017, respectively	52	27	24	105
Total other comprehensive (loss) income, net of tax	(1,898)	5,947	(7,113)	11,396
Comprehensive income	$ 14,848	$ 17,119	$ 37,948	$ 32,384