Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2011	Aug. 31, 2010
Comprehensive Income (Loss)
Unrealized gain on available-for-sale securities, balance as of November 30, 2010			$ (10)
Unrealized gain on available-for-sale securities, net change during nine month period	(10)	45	48	78
Unrealized gain on available-for-sale securities, balance as of August 31, 2011	38		38
Foreign currency translation, balance as of November 30, 2010			(22,066)
Foreign currency translation, net change during nine month period	(3,251)		19,368
Foreign currency translation, balance as of August 31, 2011	(2,698)		(2,698)
Accumulated other comprehensive income (loss), balance as of November 30, 2010			(22,076)
Accumulated other comprehensive income (loss), net change during nine month period			19,416
Accumulated other comprehensive income (loss), balance as of August31, 2011	$ (2,660)		$ (2,660)