Goodwill and Intangible Assets (Summary of Intangible Assets) (Details) (USD $) In Thousands	Jul. 31, 2011		Oct. 31, 2010
Gross Assets	$ 354,796	[1]	$ 441,810
Accumulated Amortization	151,057	[1]	192,154
Net Assets	203,739		249,656
Core/Developed Technology [Member]
Gross Assets	209,326	[1]	263,592
Accumulated Amortization	93,399	[1]	118,587
Net Assets	115,927		145,005
Customer Relationships [Member]
Gross Assets	78,400	[1]	113,020
Accumulated Amortization	28,029	[1]	55,040
Net Assets	50,371		57,980
Contract Rights Intangible [Member]
Gross Assets	32,400	[1]	30,400
Accumulated Amortization	17,489	[1]	9,522
Net Assets	14,911		20,878
Trademarks and Trade Names [Member]
Gross Assets	6,200	[1]	6,200
Accumulated Amortization	2,306	[1]	1,541
Net Assets	3,894		4,659
In-Process Research and Development (IPR&D) [Member]
Gross Assets	15,025	[1]	17,525
Net Assets	15,025		17,525
Capitalized Software Development Costs [Member]
Gross Assets	11,245	[1]	8,873
Accumulated Amortization	7,801	[1]	5,580
Net Assets	3,444		3,293
Covenants not to Compete [Member]
Gross Assets	2,200	[1]	2,200
Accumulated Amortization	2,033	[1]	1,884
Net Assets	$ 167		$ 316

[1] Intangible assets as of July 31, 2011 decreased as compared to October 31, 2010 primarily due to the retirement of fully amortized assets.