Goodwill And Acquired Intangible Assets (Summary Of Amortization Expense Related To Intangible Assets) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 31, 2011	Aug. 31, 2010
Total amortization of acquired intangible assets	$ 7,124	$ 8,017	$ 26,788	$ 23,235
Developed Technologies [Member] | Cost of Revenue [Member]
Total amortization of acquired intangible assets	2,492	3,911	12,235	11,445
Other Acquired Intangible Assets [Member] | Operating Expense [Member]
Total amortization of acquired intangible assets	$ 4,632	$ 4,106	$ 14,553	$ 11,790