Goodwill And Intangible Assets (Summary Of Intangible Assets) (Details) (USD $)	3 Months Ended		6 Months Ended
	Apr. 30, 2012		Apr. 30, 2012		Oct. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 577,390,000	[1]	$ 577,390,000	[1]	$ 364,066,000
Accumulated Amortization	213,277,000	[1]	213,277,000	[1]	168,035,000
Net Assets	364,113,000		364,113,000		196,031,000
Acquisition of additional intangible assets	212,200,000		214,600,000
Core/Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	297,186,000	[1]	297,186,000	[1]	226,928,000
Accumulated Amortization	130,491,000	[1]	130,491,000	[1]	104,391,000
Net Assets	166,695,000		166,695,000		122,537,000
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	132,713,000	[1]	132,713,000	[1]	80,238,000
Accumulated Amortization	38,992,000	[1]	38,992,000	[1]	31,250,000
Net Assets	93,721,000		93,721,000		48,988,000
Contract Rights Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	116,800,000	[1]	116,800,000	[1]	33,300,000
Accumulated Amortization	28,983,000	[1]	28,983,000	[1]	19,801,000
Net Assets	87,817,000		87,817,000		13,499,000
Covenants Not To Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	2,530,000	[1]	2,530,000	[1]	2,530,000
Accumulated Amortization	2,246,000	[1]	2,246,000	[1]	2,105,000
Net Assets	284,000		284,000		425,000
Trademarks And Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	7,300,000	[1]	7,300,000	[1]	6,400,000
Accumulated Amortization	3,116,000	[1]	3,116,000	[1]	2,561,000
Net Assets	4,184,000		4,184,000		3,839,000
In-Process Research And Development (IPR&D) [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	8,043,000	[1],[2]	8,043,000	[1],[2]	3,425,000
Net Assets	8,043,000	[2]	8,043,000	[2]	3,425,000
Capitalized Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	12,818,000	[1]	12,818,000	[1]	11,245,000
Accumulated Amortization	9,449,000	[1]	9,449,000	[1]	7,927,000
Net Assets	$ 3,369,000		$ 3,369,000		$ 3,318,000

[1] During the three and six months ended April 30, 2012, the Company acquired $212.2 million and $214.6 million of additional intangible assets, respectively. Amounts acquired are subject to foreign currency fluctuations.

[2] IPR&D is reclassified to core/developed technology upon completion or is written off upon abandonment.