Fair Value Measures (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)	3 Months Ended
	Jan. 31, 2012 years	Jan. 31, 2012 Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Fair Value, Measurements, Recurring [Member]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 2012 Municipal Securities [Member] Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Municipal Securities [Member] Fair Value, Measurements, Recurring [Member]	Jan. 31, 2012 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] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Jan. 31, 2012 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 Other Observable Inputs (Level 2) [Member]	Jan. 31, 2012 Municipal Securities [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Oct. 31, 2011 Municipal Securities [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Jan. 31, 2012 Forward Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Forward Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member]	Jan. 31, 2012 Forward Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Oct. 31, 2011 Forward Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Jan. 31, 2012 Forward Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Oct. 31, 2011 Forward Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Jan. 31, 2012 Forward Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Oct. 31, 2011 Forward Currency Derivative Contracts [Member] Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Jan. 31, 2012 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member]	Oct. 31, 2011 Deferred Compensation Plan Assets [Member] Fair Value, Measurements, Recurring [Member]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 2012 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member]		Oct. 31, 2011 Contingent Consideration [Member] Fair Value, Measurements, Recurring [Member]	Jan. 31, 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]	Jan. 31, 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]	Jan. 31, 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 Measures [Line Items]
Cash and cash equivalents										$ 515,617,000	$ 543,770,000	$ 515,617,000	$ 543,770,000
Short-term investments																		132,150,000	148,997,000			132,150,000	148,997,000
Prepaid and other current assets																										1,382,000	2,161,000			1,382,000	2,161,000
Other long-term assets																																		93,946,000	90,060,000	93,946,000	90,060,000
Total assets		743,095,000	784,988,000	609,563,000	633,830,000	133,532,000	151,158,000
Accounts payable and accrued liabilities																										16,494,000	16,856,000			16,494,000	16,856,000											1,416,000	[1]	2,096,000		[1]			[1]		1,416,000	[1]	2,096,000
Other long-term liabilities																																										1,336,000	[1]	2,200,000		[1]			[1]		1,336,000	[1]	2,200,000
Total liabilities		19,246,000	21,152,000			16,494,000	16,856,000	2,752,000	4,296,000
Contingent consideration 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 2 years.