Accumulated Other Comprehensive Loss (Details) $ in Thousands	3 Months Ended
	Feb. 28, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	$ 376,084
Balance, February 28, 2018	347,652
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	(18,999)
Other comprehensive income (loss) before reclassifications, net of tax	3,804
Balance, February 28, 2018	(15,195)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	(18,770)
Other comprehensive income (loss) before reclassifications, net of tax	3,831
Balance, February 28, 2018	(14,939)
Unrealized Losses on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2017	(229)
Other comprehensive income (loss) before reclassifications, net of tax	(27)
Balance, February 28, 2018	$ (256)