Income Taxes (Components Of Deferred Tax Assets (Liabilities)) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2011	Nov. 30, 2010
Income Taxes [Abstract]
Net operating loss carryforwards	$ 46,375	$ 38,822
Reserves, accruals and foreign related items	19,409	26,319
Credit carryforwards	14,930	18,123
Depreciation and amortization	12,760	18,424
Unrealized losses on investments	5,043	4,905
Deferred revenue	6,231	8,337
Translation gains/losses	6,772	6,030
Stock compensation expense	19,727	13,629
Other	1,374	3,170
Deferred tax assets, gross	132,621	137,759
Intangible assets	(28,390)	(34,790)
Unbilled receivable	(4,407)	(720)
Other	(2,453)	(745)
Deferred tax liabilities, gross	(35,250)	(36,255)
Net deferred tax assets before valuation allowance	97,371	101,504
Valuation allowance	(5,592)	(8,051)
Net deferred tax assets	$ 91,779	$ 93,453