Financial Assets And Liabilities (Summary Of Cash, Cash Equivalents And Investments) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011		Oct. 31, 2010
Financial Assets And Liabilities [Line Items]
Cost	$ 1,007,909		$ 945,207
Gross Unrealized Gains	296		723
Gross Unrealized Losses Less Than 12 Months	(149)		(9)
Gross Unrealized Losses 12 Months or Longer
Estimated Fair Value	1,008,056	[1]	945,921	[1]
Classified As Current Assets Total [Member]
Financial Assets And Liabilities [Line Items]
Cost	1,003,927		937,847
Gross Unrealized Gains	296		723
Gross Unrealized Losses Less Than 12 Months	(149)		(9)
Gross Unrealized Losses 12 Months or Longer
Estimated Fair Value	1,004,074	[1]	938,561	[1]
Non-Interest Bearing Cash (U.S. And International) [Member]
Financial Assets And Liabilities [Line Items]
Cost	149,998		45,687
Gross Unrealized Losses 12 Months or Longer
Estimated Fair Value	149,998	[1]	45,687	[1]
Money Market Funds (U.S.) [Member]
Financial Assets And Liabilities [Line Items]
Cost	55,267		68,099
Gross Unrealized Losses 12 Months or Longer
Estimated Fair Value	55,267	[1]	68,099	[1]
Cash Deposits And Money Market Funds (International) [Member]
Financial Assets And Liabilities [Line Items]
Cost	649,812		661,621
Gross Unrealized Losses 12 Months or Longer
Estimated Fair Value	649,812	[1]	661,621	[1]
Strategic Investments [Member]
Financial Assets And Liabilities [Line Items]
Cost	3,982		7,360
Gross Unrealized Losses 12 Months or Longer
Estimated Fair Value	3,982	[1]	7,360	[1]
Municipal Securities [Member]
Financial Assets And Liabilities [Line Items]
Cost	148,850		162,440
Gross Unrealized Gains	296		723
Gross Unrealized Losses Less Than 12 Months	(149)		(9)
Gross Unrealized Losses 12 Months or Longer
Estimated Fair Value	$ 148,997	[1]	$ 163,154	[1]

[1] See Note 6 for further discussion on fair values of money market funds, municipal securities, and strategic investments.