Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Oct. 31, 2010
Income Taxes [Abstract]
Accruals and reserves	$ 16,274	$ 15,375
Deferred revenue	47,603	53,574
Deferred compensation	36,975	32,062
Capitalized costs	98,420	102,706
Capitalized research and development costs	45,710	30,214
Stock compensation	32,186	41,370
Tax loss carryovers	36,515	54,167
Foreign tax credit carryovers	23,759	29,549
Research and other tax credit carryovers	74,110	68,345
Capital loss carryovers	1,896	7,558
Other	1,349	2,357
Gross deferred tax assets	414,797	437,277
Valuation allowance	(13,395)	(14,684)
Total deferred tax assets	401,402	422,593
Intangible assets	49,948	63,276
Undistributed earnings of foreign subsidiaries	12,631	17,331
Total deferred tax liabilities	62,579	80,607
Net deferred tax assets	$ 338,823	$ 341,986