Stock Based Benefit Plans (Details Textual) (USD $)	12 Months Ended								3 Months Ended	12 Months Ended		12 Months Ended
	Oct. 31, 2011 Year	Oct. 31, 2010	Oct. 31, 2009	Oct. 31, 2011 Performance Based Restricted Stock Units [Member]	Oct. 31, 2010 Performance Based Restricted Stock Units [Member]	Oct. 31, 2009 Performance Based Restricted Stock Units [Member]	Oct. 31, 2011 Non Performance Based Restricted Stock Units [Member]	Oct. 31, 2010 Non Performance Based Restricted Stock Units [Member]	Jan. 31, 2009 Restricted Stock Units in Lieu of Compensation [Member]	Oct. 31, 2009 Restricted Stock Units in Lieu of Compensation [Member]	Dec. 19, 2008 Restricted Stock Units in Lieu of Compensation [Member]	Oct. 31, 2011 Employee Stock Option [Member]	Oct. 31, 2010 Employee Stock Option [Member]	Oct. 31, 2009 Employee Stock Option [Member]	Oct. 31, 2011 Stock option non employee Director [Member]	Oct. 31, 2011 Employee Stock Purchase Plan [Member]
Additional Stock Based Benefit Plans (Textual) [Abstract]
Stock-based compensation expense recognized	$ 8,626,000	$ 9,332,000	$ 10,925,000	$ 3,701,000	$ 2,121,000	$ 1,045,000							$ 552,000	$ 332,000
Average closing price of company common stock				measured over any 20 consecutive trading days ending on or prior to 5 years from date of issuance of the Performance-Based RSUs increases 30% or more
Percentage increases over closing price	30.00%
RSU vesting period							Over a 4 year period					Over a 4 year period			2 year period
Restricted Stock Units issued in lieu of bonus and salary				306,000	200,000	200,000	15,497	19,663		62,051
Closing price of the Company's common stock on the date of RSUs awarded											$ 21.70
Salary deferral charged to selling, general and administrative expense									(130,000)
Shares available for issuance under ESPP	6,700,000															612,000
Employee Stock Purchase Plan termination year																2017-12
Shares reserved for ESPP																1,200,000
Discounted market price of common stock on specified offering dates subject to restrictions under employee stock purchase plan																85.00%
Discounted market price of common stock on specified offering dates without restriction under employee stock purchase plan																95.00%
Stock Based Benefit Plans (Textual) [Abstract]
Options under extended exercise period		175,813	46,052
Maximum term of non qualified stock option	10 years
Term of stock option granted under stock incentive plan	10 years
Compensation cost related to non-vested awards	$ 7,400,000
Weighted-average period to recognize compensation costs and tax benefit	2.5