SHAREHOLDERS' EQUITY (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
Sep. 16, 2011	Mar. 31, 2013
SHAREHOLDERS' EQUITY
Value of shares authorized under repurchase program	$ 215.0
Value of shares available for repurchase pursuant to repurchase program		$ 101.0

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

No definition available.

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