Earnings Per Share and Stock Repurchase Activity (Details 3) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended
Jun. 22, 2010	Aug. 31, 2013
Stock Repurchase Program [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 244,841
Stock Repurchase Program, Authorized Amount	$ 250,000

Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors.

No definition available.

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