RSU Activity (Parenthetical) (Detail) (Restricted stock units) In Thousands, unless otherwise specified	12 Months Ended
Oct. 31, 2011
Restricted stock units
Reconciliation of Restricted Stock Activity [Line Items]
Issued, shares withheld for income taxes	36

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

No definition available.

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration