Accumulated Other Comprehensive Loss (Details) $ in Thousands	6 Months Ended
	May 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive loss before reclassifications, net of tax	$ (5,215)
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	(5,187)
Balance, May 31, 2018	(23,957)
Unrealized Losses on Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	(229)
Other comprehensive loss before reclassifications, net of tax	(28)
Balance, May 31, 2018	(257)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	(18,999)
Balance, May 31, 2018	$ (24,214)