Employee Benefit Plans (Equity Compensation Plans) - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified									1 Months Ended	12 Months Ended		12 Months Ended				1 Months Ended	12 Months Ended			12 Months Ended
	Oct. 31, 2012 Stock Option		Oct. 31, 2011 Stock Option		Oct. 31, 2010 Stock Option		Oct. 31, 2009 Stock Option		Apr. 25, 2006 2005 Directors Plan	Oct. 31, 2012 2005 Directors Plan	May 23, 2005 2005 Directors Plan	Oct. 31, 2012 2005 Directors Plan Stock Option	Oct. 31, 2012 2005 Directors Plan Stock Option Minimum	Oct. 31, 2012 2005 Directors Plan Stock Option Maximum	Oct. 31, 2012 2005 Directors Plan Restricted Stock	Apr. 03, 2012 2006 Employee Equity Incentive Plan	Oct. 31, 2012 2006 Employee Equity Incentive Plan	Oct. 31, 2012 2006 Employee Equity Incentive Plan Stock Options	Oct. 31, 2012 2006 Employee Equity Incentive Plan Restricted Stock Units	Oct. 31, 2012 1994 Non-Employee Directors Stock Option Plan	Oct. 31, 2012 Other Assumed Stock Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement for options contractual term (in years)																	7 years
Additional reserved for future issuance under the 2006 Employee Plan																5,000,000
Aggregate stock options outstanding												123,649						10,200,000
Aggregate restricted stock award outstanding															57,451				3,900,000
Shares available for future grant	7,352,000	[1]	5,911,000	[1]	2,606,000	[1]	6,703,000	[1]									7,400,000
Vesting period, (in years)													3 years	4 years			4 years
Number of shares available contingent upon cancellation or expiration of prior plans																	1,200,000
Reserved for future issuance										365,464	300,000
Shares increase number of shares reserved for future issuance under the 2005 Directors Plan									500,000
Restricted stock awards issued										274,230
Aggregate grant date fair value of restricted stock awards										$ 6.2
Aggregate stock options granted under 2005 director plan												123,649
Fair value of option shares granted												$ 3.3
Aggregate stock options outstanding under 1994 director plan																				280,000
Shares assumed through acquisitions																					3,500,000
Assumed shares remaining outstanding																					700,000

[1] Excluding shares reserved for future issuance under the 2005 Directors Plan.