Income Taxes (Summary Of Deferred Taxes) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2011	Nov. 30, 2010
Income Taxes [Abstract]
Accounts receivable	$ 1,230	$ 598
Other current assets	780	815
Capitalized research costs	1,360	2,697
Accrued compensation	3,258	1,369
Accrued liabilities and other	9,469	10,722
Deferred revenue	1,540	2,743
Stock-based compensation	8,908	8,667
Tax credit and loss carryforwards	48,503	50,334
Gross deferred tax assets	75,048	77,945
Valuation allowance	(23,352)	(21,566)
Total net deferred tax assets	51,696	56,379
Goodwill	(10,629)	(9,481)
Depreciation and amortization	(3,795)	(5,783)
Total deferred tax liabilities	(14,424)	(15,264)
Total	$ 37,272	$ 41,115