Accumulated Other Comprehensive Loss (Details) $ in Thousands	9 Months Ended
	Aug. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive loss before reclassifications, net of tax	$ (7,113)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	(18,770)
Other comprehensive loss before reclassifications, net of tax	(7,137)
Balance, August 31, 2018	(25,907)
Unrealized (Losses) Gains on Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	(229)
Other comprehensive loss before reclassifications, net of tax	24
Balance, August 31, 2018	(205)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	(18,999)
Balance, August 31, 2018	$ (26,112)