Consolidated Statement of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 74,907	$ 47,444	$ 59,629
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(1,066)	(638)	(4,268)
Unrealized gain on investments, net of tax provision of $99 in 2013, $527 in 2012 and $76 in 2011	171	1,527	354
Total other comprehensive (loss) income, net of tax	(895)	889	(3,914)
Comprehensive income	$ 74,012	$ 48,333	$ 55,715