Nature Of Business And Summary Of Significant Accounting Policies (Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning of Period	$ (11,659)	$ (10,764)
Other comprehensive income (loss) before reclassifications	(3,684)	(1,275)
Amounts reclassified from accumulated other comprehensive income (loss)	1,617	380
Total other comprehensive (loss) income, net of tax	(2,067)	(895)	889
Balance, End of Period	(13,726)	(11,659)	(10,764)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning of Period	(9,249)	(8,183)
Other comprehensive income (loss) before reclassifications	(4,484)	(1,066)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Total other comprehensive (loss) income, net of tax	(4,484)	(1,066)
Balance, End of Period	(13,733)	(9,249)
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, Beginning of Period	(2,410)	(2,581)
Other comprehensive income (loss) before reclassifications	800	(209)
Amounts reclassified from accumulated other comprehensive income (loss)	1,617	380
Total other comprehensive (loss) income, net of tax	2,417	171
Balance, End of Period	$ 7	$ (2,410)