Shareholders' Equity And Other Comprehensive Income (Narrative) (Detail)	Oct. 31, 2011
Accumulated Comprehensive Income Loss [Line Items]
Number of shares authorized to repurchase	900,000

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant