SUBSEQUENT EVENT (Details) (Common Stock [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
Nov. 30, 2011	Feb. 28, 2011	Oct. 31, 2012 Repurchase of Equity [Member]
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount	$ 30.0	$ 50.0	$ 50.0

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration