Income Taxes (Significant Components Of Provision For (Benefit From) Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Nov. 30, 2012	Aug. 31, 2012	May 31, 2012	Feb. 28, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2010
Income Tax Disclosure [Abstract]
Current, Federal									$ 29,554	$ 14,619	$ 25,140
Deferred, Federal									(12,231)	2,364	(1,353)
Total Federal									17,323	16,983	23,787
Current, State									1,078	1,925	3,425
Deferred, State									(2,345)	1,341	(1,155)
Total State									(1,267)	3,266	2,270
Current, Foreign									22,919	19,490	12,314
Deferred, Foreign									(5,775)	(2,439)	(5,970)
Total Foreign									17,144	17,051	6,344
Provision for income taxes	$ 15,300	$ 7,400	$ 7,200	$ 3,300	$ 17,504	$ 11,800	$ 6,000	$ 1,996	$ 33,200	$ 37,300	$ 32,401