Stock Based Benefit Plans (Details 3) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009
Intrinsic value of options exercised and the fair value of options which became vested or modified
Intrinsic value of options outstanding	$ 16,839	$ 35,214	$ 54,646
Intrinsic value of options exercisable	$ 16,839	$ 35,214	$ 54,646

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(1)

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant