Fair Value Measures (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)	6 Months Ended
	Apr. 30, 2012 Y	Apr. 30, 2012 Fair Value, Measurements, Recurring [Member]		Oct. 31, 2011 Fair Value, Measurements, Recurring [Member]	Apr. 30, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]		Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Apr. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]		Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Apr. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]		Oct. 31, 2011 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Apr. 30, 2012 Money Market Funds (U.S.) [Member] Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Money Market Funds (U.S.) [Member] Fair Value, Measurements, Recurring [Member]	Apr. 30, 2012 Money Market Funds (U.S.) [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Oct. 31, 2011 Money Market Funds (U.S.) [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Apr. 30, 2012 Money Market Funds (U.S.) [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Oct. 31, 2011 Money Market Funds (U.S.) [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Apr. 30, 2012 Money Market Funds (U.S.) [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Oct. 31, 2011 Money Market Funds (U.S.) [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Oct. 31, 2011 Municipal Securities [Member] Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Municipal Securities [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Oct. 31, 2011 Municipal Securities [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Oct. 31, 2011 Municipal Securities [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Apr. 30, 2012 Foreign Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Foreign Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member]	Apr. 30, 2012 Foreign Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Oct. 31, 2011 Foreign Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Apr. 30, 2012 Foreign Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Oct. 31, 2011 Foreign Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Apr. 30, 2012 Foreign Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Oct. 31, 2011 Foreign Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Apr. 30, 2012 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member]	Apr. 30, 2012 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Oct. 31, 2011 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Apr. 30, 2012 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Oct. 31, 2011 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Apr. 30, 2012 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Oct. 31, 2011 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Apr. 30, 2012 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member]		Oct. 31, 2011 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member]	Apr. 30, 2012 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]		Oct. 31, 2011 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Apr. 30, 2012 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]		Oct. 31, 2011 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Apr. 30, 2012 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]		Oct. 31, 2011 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents														$ 496,218,000	$ 543,770,000	$ 496,218,000	$ 543,770,000
Short-term investments																						148,997,000		148,997,000
Prepaid and other current assets																										3,938,000	2,161,000			3,938,000	2,161,000
Other long-term assets																																		98,197,000	90,060,000	98,197,000	90,060,000
Total assets		598,353,000		784,988,000	594,415,000		633,830,000	3,938,000		151,158,000
Accounts payable and accrued liabilities																										10,087,000	16,856,000			10,087,000	16,856,000											999,000	[1]	2,096,000		[1]			[1]		999,000	[1]	2,096,000
Other long-term liabilities																																												2,200,000									2,200,000
Total liabilities		11,441,000	[1]	21,152,000		[1]		10,087,000	[1]	16,856,000	1,354,000	[1]	4,296,000
Contingent consideration arising from a business combination	$ 700,000
Contingent consideration payable period (in years)	2

[1] Includes addition of contingent consideration of $0.7 million arising from a business combination completed during fiscal 2012 which is payable over two years.