Income Taxes (Components Of Deferred Tax Assets (Liabilities)) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2012	Nov. 30, 2011
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 62,616	$ 46,375
Reserves, accruals and foreign related items	13,204	19,409
Credit carryforwards	18,534	14,930
Depreciation and amortization	10,073	12,760
Unrealized losses on investments	0	5,043
Deferred revenue	8,746	6,231
Translation gains/losses	5,673	6,772
Stock compensation expense	28,690	19,727
Other	94	1,374
Deferred tax assets, gross	147,630	132,621
Intangible assets	(37,590)	(28,390)
Convertible debt	(26,573)	0
Unbilled receivable	0	(4,407)
Other	(884)	(2,453)
Deferred tax liabilities, gross	(65,047)	(35,250)
Net deferred tax assets before valuation allowance	82,583	97,371
Valuation allowance	0	(5,592)
Net deferred tax assets	$ 82,583	$ 91,779