Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 11,172	$ 7,576	$ 20,988	$ 18,067
Other comprehensive income, net of tax:
Foreign currency translation adjustments	5,920	(1,332)	11,291	485
Reclassification adjustment for losses included in net income, net of tax of $0 for the third quarter and first nine months of 2016	0	0	0	256
Unrealized gains on investments, net of tax provision of $17 and $62 for the third quarter and first nine months of 2017, respectively and $16 for the third quarter and first nine months of 2016	27	30	105	27
Total other comprehensive income, net of tax	5,947	(1,302)	11,396	768
Comprehensive income	$ 17,119	$ 6,274	$ 32,384	$ 18,835