Accumulated Other Comprehensive Loss (Details) (USD $)	6 Months Ended
	May 31, 2014	Nov. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2013	$ (11,659,000)
Other comprehensive income (loss) before reclassification, net of tax	1,245,000
Balance, May 31, 2014	(10,414,000)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2013	(9,249,000)
Other comprehensive income (loss) before reclassification, net of tax	1,138,000
Balance, May 31, 2014	(8,111,000)
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, December 1, 2013	(2,410,000)
Other comprehensive income (loss) before reclassification, net of tax	107,000
Balance, May 31, 2014	(2,303,000)
Tax effect on accumulated unrealized losses on investments	$ 1,300,000	$ 1,400,000